In hospitals. On the factory floor. In the retail outlet. At the fast food joint. Put the sexes together and we're still trying to figure out how to make it work, trying to break free of the cloistered, sexist past. In New York, Boston, Toronto, and London.
And ultimately you have to blame popular media to some degree. In movies or shows where attractive people work together, the plot of the movie virtually always has them coupling up. It seems, from a media perspective, that you can't professional work with someone of the opposite sex (talking specifically about that situation) without it becoming romantic.
Source that this is the typical YC investor? Pretty sure this is an inaccurate generalization.
It'd be much less worse if this was a tech industry problem only. The sad reality is that we're knee-deep in shitty behavior.
And I want to stress, since some seem people to take the opposite of the charitable principle when reading posts, that this does not in any way excuse the tech industry. It just implies that it's not due to lack of socialization; it's a general problem of men.
[1] http://abcnews.go.com/blogs/politics/2011/11/one-in-four-u-s...
Edit: I thought about refraining from saying this but it really should be said: your comment is so beyond idiotic that it merits nothing except pure disgust and abhorrence.
Your further comment just reinforces my impression that it is you who are severely lacking in the empathy department.