Also important to remember that it is not just that every male waltzing into a female single sex space to meet their own needs means that every female in the space now has nothing more than the hope that this particular male does not turn out to be a predator. (Which is entirely in the gift of the male. The male gets to choose whether or not to be nice today.)
It is, perhaps even more importantly, that when a male person walks into a female only space, some females have to leave it . It excludes females from the female provision. Many females cannot use a mixed sex space .
These women are tax payers. They are in many cases forced out of the space due to protected characteristics.
It is not acceptable that female people lose access to public spaces, services, equality of accessibility and part in public life in order that male people can choose in the moment from their preferred and validating emotional choice from all the spaces and services. It's basically unacceptable. Females are not a subclass of human it is ok to deny access to.
Any more than it's ok to shrug and accept that females being harassed, intimidated, assaulted and raped is a fair price to make some male people happy.
The bottom line of this is, are you ok with being a subclass of human because you were born female? Are you happy to tell your daughter she's going to grow up to be a service animal with less rights than your son and her feelings, needs, access, all conditional on whether or not meeting them would in any way make a male person pout?