It's the same reason "Black history month" is OK (if misguided) but "White history month" isn't: because EVERY month is white history month. Likewise, for tech

It's the same reason "Black history month" is OK (if misguided) but "White history month" isn't: because EVERY month is white history month. Likewise, for tech events, if there's a focus on male-dominated things, such as drinking beer and playing Halo, or even a "hackathon" then, while it doesn't technically exclude women, the implication is that it's a "macho" event, even if that was never the intention. There simply aren't many events in tech that implicitly exclude men, while there are a lot of events, either due to who attends them (look at the conferences where 2 women show up) or how they're portrayed (using "booth babes," for instance) that implicitly exclude women.