Grammar question, which is correct?

Whose. Person A doesn't know what s/he is talking about. Whose means 'belonging to who'.

"Who's" is a contraction of either "who is" or "who has" and therefore the sentence is nonsense.

GOTI, which person are you, A or B?

Heh, "GOTI," (fish).

Yes, English can be a difficult language to learn.

It's Ghoti with an H.

Oh yeah, that's right.

I wonder if that was his intent.

No, it is an abbreviation of my online name.

Fortunately, person B.

It was unbelievably frustrating (I get too invested in arguments) as this person continually told me to read more books, and said other very condescending stuff. Now the person's deleted their original comment, presumably because they finally realised they were wrong (I linked this question, as they refused to take my word for it).

EDIT: oh no, they didn't delete it, I'm blocked.

Some snippets:

""..yet he calls out YouTubers who's (who has/have) views he disagrees with..". Take it a word at a time like you did back in elementary. " (pretty sure it would be whom here as well, I don't know).

"I can very much tell English isn't your first language, that was obvious from your first comment. It's blatantly obvious as you have a very unsteady grasp on what a contraction is, how it works, when it's appropriate to be used, and why. Parroting my own words back to me in an attempt to seem like you understand what I've said doesn't make you appear informed, either. Like I said, books, read them, lots of them. And really, don't try to "teach" people things that you yourself are wrong about. If you wanted to know what the difference was, you could have just asked me, I'd of been happy to explain it to you if your dictionary.com app wasn't working."

"your overall grammar is atrocious."

...Some people... smh.

arghhhhhhhhhhhhhhhhhh