Even on the old GCdebatesQT sub, GC people were arguing men have a right to "sex-segregated" spaces for dignity, privacy, etc.

Far more people were arguing that it doesn't matter whether women want to go into male spaces (and in fact many women do go into male toilets when the need arises, i.e. no toilet paper or lengthy cues). The ones who took issue also generally did so because they knew this would be an overture to freely violating women's spaces next.

Like, I could use bopomofodojo's comment above to argue that GC doesn't care if passing male trans people use female bathrooms, but we both know that cherrypicking a few exceptions doesn't erase what the vast majority of the movement agrees on and actually fights for.