I need your opinion on dancers..........?

OK, so if you read my other question, when I have my daughter, it is my dream for her to be a ballerina. I know that it all depends on how you raise a child, but...We have this special dance program at our school for girls who have been dancing since they were little. They're like the cheerleaders of our school. They're so MEAN and preppy. I want your honest opinion. Are a lot of dancers like this? I also noticed that a lot of girls in that program are emotionless, they stick to their own 'dancing group', and rude. I don't want my daughter to turn out like this. Do a lot of dancers have this attitude? If so, why, what makes them so uppity? Do they think they know everything?