From the stories that have come out it sounds that avoiding this behaviour is practically impossible to avoid if you are woman. That's a terrible working env.

This also appears to be an American problem. I find this difficult to imagine happening as pervasively ( not saying it doesn't happen at all) in London or Berlin or any of the other European tech hubs. The problem may be more evident in America because it has the largest and most successful tech community presenting more opportunities for alienating behaviour around women to be amplified. The reasons are likely to be more multi-faceted and complex.