The answers in this thread are telling, and they don't paint a pretty picture.
Here's my hypothesis: Geeks (myself included!) tend to be lone wolves. We like autonomy, and hence have a strong belief in personal responsibility, often at the detriment of shared responsibility. See how many libertarians are on /.?
Geeks also tend to have girl problems. They're often intimidated by them, but also want and can't have them. This leads to resentment. Women seem incredibly powerful and unattainable, so when they claim disinfranchisement, we are incredulous.
In the sciences, geeks rule. Women who enter this field have to be fun, approachable and totally geeky too. Not many women fit that description. But many who don't are otherwise fantastically gifted, intelligent women. And we're missing out.