How to correct peoples' grammar.
Sorry dear, that's not grammar.
It's spelling and punctuation.
https://www.grammarly.com/blog/3-punctuation-mistakes-that-can-make-you-look-like-a-cannibal/
Anything involving punctuation is grammar, dear.
Their definitions when looked up clearly are different.
Grammar: "The whole system and structure of a language or of languages in general."
Whether or not the two are different, any time a correction is needed with regards to contractions and their homonyms, it is a mistake of grammar - not punctuation. If the person wrote "youre", that would be a punctuation mistake where they omitted the apostrophe. But, when using "your" instead of "you're", it is a grammar mistake because they are using the wrong word to convey their ideas. In the same way that mis-using "there", "they're", and "their" is a grammar issue.
So it's grammar.. but "specifically" it's puncutation as well as spelling.
Because they know it sounds like your, but they didn't think about the puncutation or spelling needed for the correct word.
I'll be honest, ppl are too lazy to type properly on a "reddit copy" game boards for 13 year olds, but we all know 11 year old play aswell, as faking your age is so easy.
And you can't expect people who recently learned English to know all this stuff. I mean it's NA, people from Mexico share with us too.
So the only satisfaction grammar people get on here, is the fact they look like an ass to most people. Correcting others only for their own satisfaction knowing they probably achieved one thing in their time wasted on the boards.
^_^
* peoples'