Kate, thanks for speaking up about this on a (semi?) national platform. Letsrun is a harsh environment to defend unorthodox views, and FWIW, the hostility you've encountered here is probably more about the medium than either what you have to say or the audience.
My 2c: This is not local to Duke. Back when we were choosing schools in 2006, a friend visited Williams during open house, liked it, and then was just SO turned off when the main social event being advertised to pre-frosh was entitled "CEOs and Corporate Hos" with dress code according. Where I went was relatively progressive with regards to this --rarely anything so overt as big parties emphasizing male power and female availability--but the same nonsense was always lurking beneath. It hit the fan this year with a big Title IX complaint that the school was basically complicit in the systematic underreporting and mishandling of sexual assault cases. Once you get a sense of just how widespread assault is on campus it's hard to think of this as just "liberal whining" or "PC language controlling" or whatever.
This isn't to say it's easy to establish the link between generally pervasive attitudes of female weakness/purity/temptation and gender-based crimes, including sexual assault; for instance Norway is pretty progressive w.r.t. these issues and they have really high sexual assault rates. (It might just be that their reporting is better). But if you listened to what those Steubenville boys had to say on tape -- and about whether non-penetrative sex counted as rape if the girl was unconscious -- I think it's hard to argue that a rape culture doesn't exist and that it doesn't at least contribute to a serious problem.
Thanks for sharing, Katie.