These guys aren't actively conspiring to exclude women from tech (in fact, they tend to jump at any superficial opportunity to demonstrate the opposite), but they're angry about being called sexist and they really don't want to capitulate to the suggestion that their behavior merits serious adjustment (which is not surprising considering the correlation of ego with 'brogrammer').
The surplus of cash and minor acclaim only emboldens their resolve; there is a subconscious belief that their financial success has conferred the wisdom to authoritatively determine the appropriate bounds of sexual commentary for a professional setting and anyone who can't deal with sexist bullshit can just get the fuck outta tech because the startup is king and sensitive women (and men) just can't handle the heat of 60 hour weeks spent reclined in front of a widescreen LCD.
These chauvinistic kids really need a wake up call, but frankly, I fear the money is just too good for them to ever really care.