I'm not big on cheerleading. I really hate to agree to the stereotypes because I am so sick of people being stereotyped, but I'm going to say that the one about cheerleading fits all the cheerleaders I've ever known- school team and competitive. I've tried, really tried to be friends with some of the cheerleaders at my school but they just tend to look at my like I'm a freak and walk off. They're also really loud and obnoxious in the halls. The cheerleading captain actually got busted the last week of school lighting bras on fire in the girls bathroom because she thought it would be funny. It wasn't because ALL of the bathrooms in my school, except for one, had already been closed due to fires, bras, human feces, and bomb threats. So she would have gotten that one closed, too, if it hadn't been the last one open.
I was also "friends" with a cheer captain in elementary school. She went to competitions and everything, just like you. She went to some big regional competition once and all she did was complain when she came back and her team had taken second. She also took every opportunity to stab me in the back.
As for cheerleaders that I haven't gone to school with, I was in WDW last year during the Pop Warner football championships. The teams brought their cheerleaders with them (and I'm sure that some of them must have competed nationally) and all they did was run through the parks screaming, not paying attention to where they were going, who they were running into, who they were stepping one, or who they were cutting in front of. We saw one group take up one entire side of the staircase to the train station in the Magic Kingdom (the one you see at the entrance in Main Street USA) for about 15 minutes, just to take pictures. There were people clearly annoyed and a cast member was called over. Then they just walked over and stood in a gigantic line in front of people already lined up for the nighttime parade. A lady that had been there as long as we had (maybe longer) asked them to move because she had a young kid and he couldn't see. One girl just glared at her and turned back to the street. The cast member had to come back and ask them to move elsewhere.
They were also, what I would consider, VERY inappropriately dressed for a day at Disney. I could see some of the girls' underwear when they sat down.
That's why I have a general dislike for cheerleaders, because I've never met one that felt like they could be nice to me just because- they were all nice to me to get me to do their homework so they could run off with their boyfriends.