Contractions definitely aren't rude to use in informal conversations. It's difficult to say why anyone would change your text on SE network that way, but it definitely isn't usual.

The only reason I can come up with is that if you're not a native speaker or your English isn't good enough, someone was trying to help save your question and dramatically edited your original text while subconsciously replacing all the contractions with no more reason than their own habit.

Answer from Frantisek on Stack Exchange
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GCFGlobal
edu.gcfglobal.org › en › grammar › contractions › 1
Grammar: Contractions
I want to... ... A contraction is a word made by shortening and combining two words.
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WordReference
forum.wordreference.com › english only › english only
Contraction of "I am" | WordReference Forums
February 3, 2018 - Writing here on this site is not formal writing and as in speech, contraction is optional AND normal. ... If "am" is not emphasised and the writing is informal, use "I'm" If you are recording or imitating what the person actually pronounced ...
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Quora
quora.com › Is-it-considered-grammatically-incorrect-to-use-contractions-such-as-Im-instead-of-the-full-form-I-am
Is it considered grammatically incorrect to use contractions, such as 'I'm,' instead of the full form, 'I am'? - Quora
Answer (1 of 2): Short answer, no. Longer answer, it depends on when and in which context the contraction is being used. * “I’m going home/I am going home” — both are totally correct, although not using the contraction may sound slightly more formal Not choosing to use a contraction can help m...
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Enchanted Learning
enchantedlearning.com › grammar › contractions › index.shtml
Contractions - Enchanted Learning
March 9, 2006 - A contraction is a shortened form of one or two words (one of which is usually a verb). In a contraction, an apostrophe takes the place of the missing letter or letters. Some contractions are: I’m (I am), can’t (cannot), how’s (how is), ...
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Have a look at this thread The basic idea is that contractions aren't just shortened versions of words, but are subject to their own grammatical rules.
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Here's the comment I made in a similar thread on this subreddit . The bold rule from Lakoff is the relevant one. The NP-Host Constraint: Auxiliaries may only cliticize onto an NP. Kaisse (1983) That explains why these are bad: * Not [even in New York]'s John considered easy. * Not [for a minute]'s he been happy here. * [That John finally ate]'s making momma happy. * [That we eat a lot]'s been making her miserable. Another rule: If at any point in the syntax, a constituent immediately following be is deleted, then ... be cannot undergo contraction. [so, "I am hungry" has "hungry" deleted, so that makes the contraction bad.] - Lakoff (1970) Wh-movement * I wonder where the party's [e] tonight. * I wonder where John's [e]. * I wonder who that man's [e]. Null VP * You're leaving and he's [e] too. * Either John's left or Bill's [e]. Comparative Subdeletion * There are more researchers than they're [e] teachers. * The table's longer than it's [e] wide. Heavy NP Shift * John's [e] to Mary the best friend in the world. * Mary's [e] after Jane the best athlete on the team. Distributed Nominalization * The decision's [e] to go ahead with it. * Mary's picture's [e] of John in Shirley in Mahopac. -Examples from Kaisse. Kaisse also notes parentheticals are prevent application of this rule (but some theorize parentheticals involve movement, so we can analyze this as above). * John's, I think, eaten dinner already. * John's, Bill said, an excellent writer. * John's, to my knowledge, a good doctor.
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Langeek
langeek.co › home › grammar › punctuation and spelling › contractions
"Contractions" in English Grammar | LanGeek
2 weeks ago - There are contracted forms of some phrases that make a text even more · informal. Here are the most common ones on the list. gonna → going to, wanna → want to, gotta → (have) got to · lemme → let me, gimme → give me, kinda → kind of · ain't → am not/are not/is not, whatcha → what are you
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YouTube
youtube.com › english with lucy
How to pronounce the contractions in English - we'd | they'll | he'd | they're | it'd - YouTube
Learn how to pronounce and use contractions like I'M, WE'D, THEY'LL, WE'RE, THEY'RE, HE'D, IT'D. I will teach you the correct usage and pronunciation of thes...
Published   June 22, 2022
Views   603K
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Learn English
learnenglish.ecenglish.com › lessons › contractions
Contractions | Learn English
Native speakers usually use contractions especially when speaking. We make contractions by connecting two or more words together. One or more letters are removed from the words when they are connected. I am → I'm →"I'm older than you." I had →I'd → "I'd better do my homework."
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University of Nevada, Reno
unr.edu › university › writing & speaking center › writing & speaking resources › contractions
Contractions | University Writing & Speaking Center | University of Nevada, Reno
Contractions that take out the first letter of the second word: I’m = I am · They’re = They are · I’d = I had · She’s = She is · How’s = How is · Contractions that take out the second letter of the second word: Note: Contractions that use the word “not” will replace the “o” with an apostrophe (‘).
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San Jose State University
sjsu.edu › writingcenter › docs › handouts › Contractions.pdf pdf
Contractions [pdf]
Contractions, Fall 2011. Rev. Summer 2014. 3 of 3 · Answer Key for Activity 2 · 1. can not, I am · 2. It is · 3. They have, have not · 4. must not · 5. She will, he is · References · Nordquist, Richard. "A List of Standard Contractions in English." About Education.
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Scribbr
scribbr.com › home › contractions (grammar) | definition & examples
Contractions (Grammar) | Definition & Examples
May 2, 2025 - Contractions are words or phrases that have been shortened by omitting one or more letters (e.g., “You’re”).
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Grammarly
grammarly.com › blog › grammar › contractions
What Are Contractions in Writing? Definition and Examples | Grammarly
August 10, 2022 - If the main verb is be, then the ... uses is and isn’t). If the declarative statement uses a main verb other than be, the tag question uses a negative contraction formed with do and not. ... You may have heard some people use contractions like amn’t or ain’t, but these ...
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University of Sussex
sussex.ac.uk › informatics › punctuation › apostrophe › contractions
Contractions : The Apostrophe
Note in each case that the apostrophe appears precisely in the position of the omitted letters: we write can't, not *ca'nt, and aren't, not *are'nt. Note also that the irregular contraction won't takes its apostrophe between the n and the t, just like all other contractions involving not.
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Cambridge Dictionary
dictionary.cambridge.org › us › grammar › british-grammar › contractions
Contractions - English Grammar Today - Cambridge Dictionary
We use contractions (I’m, we’re) in everyday speech and informal writing. Contractions, which are sometimes called ‘short forms’, commonly combine a pronoun or noun and a verb, or a verb and not, in a shorter form.
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Stack Exchange
english.stackexchange.com › questions › 276391 › appropriate-usage-of-i-am-im
contraction vs full form - appropriate usage of I am / I'm - English Language & Usage Stack Exchange
September 27, 2015 - I.e, there should be a stressed verb in every clause, and you can't stress contracted auxiliary verbs. Contrariwise, I am is very rare outside this and similarly specialized situations; normally one says I'm, you're, he's, she's, we're, they're whenever possible.