It's probably based on what you're saying on here. Based on your profile, saying stuff like "everyone always says that I'm... very funny" sounds conceited and is the type of thing that'll make people dislike you. Also, asking questions like this and fishing for compliments and affirmation is not an attractive quality either. I don't mean to sound rude, but you were looking for an answer.
One has nothing to do with the other... If you are being called rude, then spend about 15 minutes a night recalling the day's events. Keep a journal. Figure out the events that lead to the name calling and try to reverse the pattern. I hope you have success. Oh... you are pretty.