And remember the school teacher? Who posted that there was now a male, teenaged pupil allowed to change and shower in the girls' changing room. The school had offered a much smaller room to any girl who felt uncomfortable with this arrangement.
(This is in the context of US schools where pupils undress and shower often in fairly openplan facilities, not individual cubicles with a door.)
None of the girls had complained or made a fuss, but first a few then many had decided to use the alternative facility.
The teacher came on to Reddit what to do about this, as the male pupil wasn't happy with the girls excluding themselves (and couldn't, of course, join them in the room provided just for the female students).
The answers were shocking - the girls should be punished, forced to change and shower with their male classmate, the alternative room should be labelled for transphobes, the girls should be excluded, shunned, publicly reprimanded and on and on.
It didn't matter that the teacher stressed that the girls were otherwise including this male classmate in their spaces and groups and were not being mean.
Self-exclusion is an act of non-compliance. It must not be tolerated.