If these girls were doing it for feminism's sake, they'd be just as likely to bust out with the half-naked dancing in the company of women, or alone in their rooms, as they were at frat parties. Maybe that's what's going on, but I doubt it.
I don't particularly think this means that these girls are particularly anti-feminist either, though. Doing stupid things to get attention from the opposite sex isn't limited to one gender . . . I mean, who's passing out the free beer hoping that it'll help them get them laid?