Are they still illegal if the providers are pretending hard that mixed sex isn't mixed sex and trying to punish/intimidate anyone who won't play along?
I don't mean to sound flippant, it is after all appalling, as this 'pretence' that mixed sex isn't really, in order to nurture a man's choices and self expression, means actively excluding women from women's spaces (which is illegal, but apparently no one cares since they're women), and requiring that women's right of access to space is predicated on their being willing to undress their body to meet said man's needs and submit to male entitlement over them. Which is plain abhorrent and the kind of thing the Geneva Convention was written to prevent.