.

“Chat is a fourth person pronoun” It’s a noun. You idiot. It’s not even a pronoun it’s a noun.

when a teacher says “class, what do you think the answer to #2 is?”
“Class” is a noun. A specific term for a collective is a noun. A generalized term to use in place of a noun is a pronoun. “Guys” is a noun. “Friends” is a noun. “Chat” is a noun.
“You (plural)” is a pronoun. If you’re talking to the chat (ie viewers) and you use collective you that would be a pronoun.

“Chat, what do you want me to play today?”

chat is a noun. you is a pronoun.