I wouldn't lead the question by telling them that you were supposed to be annoying, because then they will look for things that annoyed them about you that they may have not noticed otherwise. I would tell them to be brutally honest, and, to be honest, if you're wearing the 'suit' of someone else, you could just ask them if you seemed like the kind of guy they would hang out with. Then note their response down in a survey like manner.
Tell them you're a student actor trying out some character traits. The character you're playing is supposed to be a bit annoying or unlikeable. Ask them how you went in portraying those traits.