Girls can be really nasty to each other. In creepily subtle ways. Ick.
Back in my early twenties I never called anyone a bitch, I made a concerted effort not to because, fresh out of women's studies classes, I truly felt that every time I said it, I set feminism back a tiny tiny bit. It was too easy, I felt; there were better ways to express how I was feeling than to degrade another woman like that. And I still think I was right. But I'm ten years older now and far less patient, and some people are just bitches.
Why can't we just be freaking nice to each other?