When I got here it was just one downvote, so it's probably risky to ascribe one reason to it, and this is way too much of a generalization anyway, but I'll put it out there anyway...

I've met a lot of hacker types who are vehement about the fact that they are not racist or sexist, to the point that they take offense that women are kept out of technical fields due to sexism. I believe this could lead to a kneejerk reaction that gender equality is a non-issue, and any attempts to address it are nothing more than affirmative action undermining technical merit.