I would like to have somebody say something to my face. Sitting beside people in class while they say things about people yet pretend to be friendly face to face with that person, pisses me off.
When somebody does make a serious (as in they're not just joking around) insult to my face, I can win in a verbal fight/argument/debate. That is, unless they are somebody who is so stubborn and non-sensical with their arguments that my brain starts to hurt from trying to comprehend the verbal diarrhea they're spewing all over me. (Yeah, I get a bad picture in my head while reading that too
)
Take for example silly little arguments about whom is smarter:
"You're stupid." (Actually serious)
"And of course you've got a degree in quantum mechanics (
)"
"I'm way smarter than you." (Actually serious)
"At what?"
"I... I've got more street smarts than you." (Actually serious)
"And tell me, when in life is knowing where to buy drugs going to get you anywhere?
"
"Well... You're stupid." *Walks away* (Yeah... He's actually serious)
I try to be serious about my school work, follow the rules, and just generally stay away from the people who do stupid shit.
/ 
