> Virtually every state has a prohibition on the use of public spaces that specifically prohibit discrimination on the basis of sex or gender
This ties into a very specific confusion about affinity groups. Specifically, they generally are not exclusionary (in part because it's largely illegal). The only thing preventing boys from participating in a "girls who code" type of event is the boys don't want to go to something with "girls" in the name.
I blearily put this reply to the wrong top-level comment earlier, but ...
That very much depends on the group.
Years ago, my wife founded two chapters of a national organization who did "girls who code" sorts of things. There was (to her) a surprising amount of infighting about how to handle registrations from males. Leadership felt that men should not be allowed to attend, but there were at least a couple of chapter leads (including my wife) who felt that men should be allowed to attend, but where spots were scarce, they should be prioritized to women.
Disregarding the politics of it, there was definitely not a shortage of men who were discouraged from signing up because they were somehow icked out over the name. I'm sure some men were, and I'm sure others probably deferred on the grounds that they didn't want to take spots away from those for whom the mission was intended -- but because the organization was unwilling to publish official guidance for reasons I won't bother to opine on, my wife was routinely in the position of having to explain her attendance policies to men who had signed up
This ties into a very specific confusion about affinity groups. Specifically, they generally are not exclusionary (in part because it's largely illegal). The only thing preventing boys from participating in a "girls who code" type of event is the boys don't want to go to something with "girls" in the name.