I think I have a different perspective on this topic than most here. My wife has founded multiple companies. I also have two daughters (and a son). One of which is very interested in programming. I'm older, but back in college and early professional life I worked with a number of women. Myself and my colleagues treat them the same as the rest of the team. There certainly weren't a lot of women, but we didn't treat them any different.

But the current generation of young techies seem to be outright hostile towards women. All you have to do is read some of the comments on HN whenever a topic in this area arises. From some of the things I read in comments I seriously give pause on whether I should push my daughter in programming/tech. Some women can tolerate this hostility better than others, but I don't see it going away anytime soon. I really think the problem is with the attitude of the modern young techy towards females. I don't know where it comes from or how to fix it. But it worries me.