I'm going to argue that media that is very important to geek culture may nonetheless contribute to a hostile work environment.
Great, you're really advancing the cause of women in tech that way.
Take Asimov. Widely held to be a wonderful science fiction writer, and a touchstone of geek culture. But his books don't handle women particularly well, if at all.
Yes, and so what? Asimov wasn't all that good at human characterization in general; with few exceptions (including one woman - Susan Calvin - though she was a stereotype as well) his human characters are little more than set pieces to drive the plot. There's reasons for the lack of women in Asimov's stories, some of which Asimov wrote about himself. And Asimov himself was known as a womanizer and a groper; he got away with it because he was Asimov and fame like rank has its privileges.
But the inclusion of SF in geek culture isn't about geeks thinking SF stories are the way the world should be nor about venerating SF writers personally. If it were, the inclusion of _The Left Hand of Darkness_ and "Houston, Houston, Do You Read?" (among others) in the SF canon would be hostile to various more-well-represented-groups as well. And then there's Heinlein, in whose works you can find something to offend anyone; _Friday_ alone can easily offend arch-conservatives and feminists alike.
It's not that feminists hate science fiction, it's that science fiction, especially "classic" science fiction, has a problem with women. And if you're a feminist, the most terrifying thing in the world is a vision of the future with the women of the 50s.
If that last statement is true, feminists need to get a sense of perspective. There's far worse treatment of women in parts of the world today than in the US of the 1950s. And if feminists have a problem with the books enjoyed by geeks because the authors were not themselves feminists or those books didn't meet the feminist standards of gender ratio or female characterization, that's really their problem; stretching geek enjoyment of such books into a hostile act just makes geeks (justifiably) defensive.