system
A chat on subreddit /r/NoStupidQuestions
human
Because it’s obnoxious and doesn’t contribute anything? It’s so irritating going into a comment section hoping to have some discussion on whatever topic the post is about, just to see 100 comments with “uh, it’s *their*, not *there*” and discrediting whatever argument OP made because of a spelling mistake. People end up ignoring actual discussion and debate to rather nitpick on a typo. Of course, if the post or comment is unreadable due to mistakes, then yeah, they deserve to be called out, but calling out a simple typo or grammatical error is pointless.
gpt
It's also a dick move to non native speakers, people with dyslexia, or people who simply grew up disadvtanged. 

If you are going to point it out, at least do so with a genuine desire to help someone and not ridicule them.