Exactly. A mixed sex toilet does not validate them, because any sex can use it.
As I never tire of saying, it has absolutely nothing to do with the toilet itself. It's just a room with four walls and a ceiling.
It's got everything to do with the women in the room. They are the resource, they are the prop, they provide the validation and excitement, they are the tool.
It is the women who are being utilised, not the space.
Their presence is crucial.
Hence the lack of interest in gender neutral/mixed sex spaces.
The validation and fun is all next door in the ladies with the unconsenting women.