When I hear about this being a cultural thing, an important aspect people leave out is that men aren't exactly encouraged to be coders either. Writing code has pretty much no social cred until you're out of school, and pretty much automatically gets you tagged as a nerd. No coder I know started coding because it was cool, they just sort of enjoyed it and accepted the social consequences.

I'm just going to throw this out here: only about 10% of nurses are male. Yet I rarely hear about the cultural problem of not having enough males in nursing, or how we can encourage more male nurses. Same goes for elementary school teachers. Why is that?

Just because there's a gender imbalance doesn't necessarily mean anyone is keeping anyone out. And if a few insensitive comments can keep you from doing what you want to do in life, maybe that's something you have to deal with -- there's always going to be haters no matter what you want to do.