What about all the women founded startups, do they have bro culture as well?
http://www.huffingtonpost.ca/entry/mans-suing-yahoo-for-gend...
But men told to shut and and man-up
Some examples: Model View Culture had a technical cofounder. You probably haven't heard of her. The founder you heard of felt okay abusing and terrorizing her, then totally erasing her from MVC's history. Another example that's more public is that Yahoo! executive, she sexually harassed (and... uh.. probably sexually assaulted) women around her.
So yeah, maybe some do. It should be opposed. If you're a man and see this, it can be challenging because men acting in bad faith have made the narrative of a man opposing a woman on feminist tenants petty difficult to sell.