Jerk.
You're ugly.
I don't want to be seen with you anymore.
Go to Hell.
I have fantasized about bad things happening to you.
Nobody likes you.
I'm sorry, but your existence is making me sick.
You sure are stupid, aren't you?
Well, who's stupid now? You are.
Hey! What's that disgusting growth coming out of your neck? (as if surprised) Oh! It's your head and face!