Some people are jerks. That's true of all contexts of life. Jerks should be shunned not because they are sexist, but because they are jerks. If a guy who's a jerk starts a company, he'll probably hire other guy-jerks, miss out on having some balance on his team, and have a crappy company no one wants to work with. If a non-jerk guy starts a company, he'll probably make efforts to create an environment that's as respectful and balanced as he is, and not hire jerks. Respect is important - I wouldn't hire someone who's consistently disrespectful, no matter their gender.
I'd argue that the reason why there's a whole "women in technology" drama going on at all is because a lot of people (quite independent of them being male or female) in the tech scene are jerks. (this is also why this is an even bigger problem online, because as we all know, a large proportion of people follow the GIFT theory online and act like complete assholes, making statements that would get them ejected out of any social situation)
Why are there so many jerks in technology? We could spend forever discussing that, but probably for the same reason that any successful industry attracts jerks, male or female.
The problem isn't worth worrying about in a generic sense. I look at this as a "intelligent, civilised person vs jerk" problem, not a "male vs female" problem. That problem is as old as the world, and as someone who (I hope) is not a jerk, I don't deal with it using generalities, but targeting specific jerks if they can't be coached into being civilised.
In other words, if you identify someone who's regularly being a jerk, deal with them. If you're in charge and you're creating an environment where people are being jerks, look in the mirror.
Otherwise, don't waste time thinking about this "issue".
Edit: Worth adding that this doesn't mean it isn't worth thinking about the issue of sexism in general - that is something where we still have to make a lot of progress, especially in some parts of the world - but that's not specific to technology at all.