My depression been kicking me ever since this girl said that to me

Jess

So I just started school mind you I've never spoken to this particular person, I'm also the shy type I don't talk and I stay to myself yesterday in class I laughed because something was funny,and she proceeded to say out loud "why are you laughing you ain't shiit " and I keep telling myself to not take it personal but I can't stop thinking bout it and I'd be lying if I said it didn't hurt...