Johnny, you kill me. You may well take this year's Oscar for Best Comic Performance on a Discussion Board.
No, of course it's not like you're suddenly interjected into an episode of "The Frat Boys Decide to Show Up for Class." But the truth is, less than a third of b-school students are women. I would not call less than 1/3 "nearly half." As I sat in classes, I definitely noticed the disparity. I suppose it may depend on where you're coming from. My work place is about 50/50 with the women having a slight edge. My college was the same way. My friends are the same way. And now I'm signing up for an environment with a whole new status quo.
I'm not complaining about it, but lord knows it's going to be a shift from anything else I've done. I feel pretty confident in my ability to interact in such an environment, and I am not one who constantly cries about the patriarchy. But imagine that you are a woman surrounded by men. Due to a lifetime of "girls-can't-do-math" vibes, you're not confident in your analytical skills. You feel intimidated and don't want to call attention to your supposed inability to do math, so you refrain from asking questions during your finance class. Yes, that sounds like a great education to me.
No, no one SHOULD be intimidated by b-school. And we should all realize that we are pouring out LOADS of money for this education - and I certainly intend to get my money's worth, even if I seem like an idiot for asking questions in the finance class. But, from my limited experience and from what women who are currently at b-school have told me, I think we'd be a little pollyanna to assume that business school is a utopia of gender neutrality.