It seems like the startup was still pretty small, but the plaintiff was hardly the only employee there. If you're working in an environment like this, I think you have a very real responsibility to speak up. If that doesn't work you should leave. Anyone working in tech, especially in SV, has alternatives. You have a moral responsibility to squash out this kind of behavior by making it clear it's not an acceptable workplace - even (especially) if you're not the target of harassment.