Emily's Cat
Rarely prone to hissy-fits
When the right to control your own body is at stake, I'd say music festival attendance requirements are slightly less basic a human right. Let's get the important stuff down first: people's bodies, people's employment, marriage, child custody, healthcare, that sort of thing. We can worry about how many government forms contain the option for "ze/zhir" afterward.
But that's my optimism striking again. Clearly people prefer to wrangle over the less important matters. The state decides your womb's occupancy? Meh. A girl with a penis uses the toilet stall in the ladies room at the mall? Eleven threads and a billion posts.
I'm rather of the opinion that regulatory acknowledgement of what constitutes a female and what constitutes a male are foundational elements that must be hammered out well before any other aspect of sex-based rights can even be addressed. Otherwise, we end up with the situation into which we're quickly sliding... where a person's unverifiable, subjective, internal belief about the stereotypes they like best are being given primacy above the reality of sex. Where female victims of rape and abuse are being driven out of shelters intended to provide support, in favor of males who demand that they must be included in those female-only centers. Where female prisoners are being put at risk from fully intact male inmates with violent pasts... who have "discovered" their "true selves" while incarcerated, and who are moved at their desire to shared spaces with those females. A world where teenage females in school are told that they have no right to expect visual privacy from males in a female-only shower.