If you think the world of poker isn't the most friendly for women think what a gaming forum is going to be like with all its "you're gunna get raped" jokes.
In your example, the mood only soured when the guy sat down. It wasn't anything he did in particular, beyond just brazenly entering a women's tournament. It's solely that he was male. No one looks good in that example.
Always a bad sign in forums. The mods' decisions being infallible is more important than the rules being applied correctly? Never ends well.
They're official forums. A subreddit or even this thread on GAF is a better place to criticize and organize. Do any official forums let rioters run through the streets openly calling out mods? Just protecting the brand/image is all, as reprehensible as it is. The rape threads and bikini stuff is just inexcusable.