This article from Mother Jones about the rise of “brogrammer” culture in the tech startup/Silicon Valley world is infuriatingly accurate:
I’ve had a few people ask me if this sort of behavior is the norm or the exception. As a long-time resident of the San Francisco Bay area and fringe participant in the tech startup scene, and a veteran of over 100 tech conferences, I can confidently answer this with: Brogrammer culture is utterly pervasive in this field. The norm, especially in hot new startups with lots of VC funding and the potential to cash out big, is brogrammer culture. In Silicon Valley and similar areas, it takes significant, deliberate effort to create a culture in which women don’t feel marginalized.
My opinion is that VCs should start insisting on anti-brogrammer measures in the companies they fund. Start early and the transition to obeying anti-discrimination laws when you hit 55 employees will be less painful. And the companies you fund will be more profitable, have a higher chance of success, and use less capital if you have women involved in managing the company.