Generally speaking, it's always enlightening when a male person explains that he won't use male facilities with fellow males because they make him uncomfortable, but that women have no right to exclude him because he makes them uncomfortable.
The right to choose who is around us doesn't exist. Noone can force unwilling people into our presence.
The right to choose who isn't around us does. Gellman should perhaps read the law a little more closely. The explanatory notes do a helpful job of explaining the law to those who have failed to grasp proportional and legitimate, with examples that clearly explain that if women are likely to avoid using a service for their own sex because a member of the opposite sex wants to use them, excluding that member of the opposite sex is allowable.
Gellman's little 'history lesson' about the exclusion of women has been written from Gellman's perspective as a member of the sex that wasn't excluded. Perhaps that accounts for the errors. Gellman is a member of the sex that had public toilets, whilst my sex did not. Even where public toilets were not available, Gellman is of the sex that has always been able to pee outside up against a wall or a tree, without needing to undress. To this day it is acceptable for the male sex to urinate in public, and they still do.
Bold move to claim that sex-based rights don't exist. Transparent, unfortunately, that the author has celebrated this misconception (despite apparently identifying with my sex) as a gleeful thing.
It reads as a long and inaccurate diatribe of "the female sex have no rights, I am thrilled to believe this, and if I as a member of the opposite sex want access to you all, there's nothing you can do to stop me"
Fortunately, Gellman is wrong, and this piece helpfully illustrates the lengths to which the opposite sex will go to demand that we have no rights to exclude them from accessing us.