It does not matter how lovely or safe a male person is: some women cannot use mixed sex spaces. They can't. A male walks in to live his best life and have his most comfortable choice from all the facilities and by doing so some women lose access to any facilities at all .
Disabled women, many Autistic MNetters have talked eloquently about this. Women who have experienced CSA/DV/DA and cannot be in an enclosed space with an unfamiliar man, never mind undress; women of orthodox faiths and religions, many other women too.
Even if we could perform a Vulcan mind meld on every male entering the space and know this is an absolute sweetheart of a male, of which on the planet there are many, those women still could not use the space. And if he's a lovely safe male he would understand that and not wish to exclude them. Or expect them and their lives to revolve around what he expresses to them is currently going on in his head.