Can't stereotype like that.
I was a cheerleader and on the Pom Pon team for all of Middle School as well as HS. The only reason i'm not on the cheerleading team now in college is because the team sucks, none of the girls can dance and well, they suck, lol.
And I was never a bitch, I was never an airhead, I was never rude, I didn't run with the "clique" of jocks and other cheerleaders. I was on the debate team, chess team, I had a 4.0 GPA, graduated validictorian, and I was cool with all the little "cliques" at the school.
Skaters, Goths, Jocks, cheerleaders, the bad boys, the ghetto girls, the preppy kids, etc.
It depends on the person, not their extracurricular activities.