The local movie theater has a unisex bathroom and a ladies room and a men's room too. That way women that want to avoid psychopaths use the ladies room where men are not allowed no matter how short their skirts are.
So the ladies room is for real women, and the men's room is for men, and the unisex bathroom is for god-only-knows-WHAT-that-is?
The unisex bathroom is for whoever doesn't want to be classified or who can't be classified. Parents use it when a Dad is with his young daughter and doesn't want her to go into the bathroom alone. Dad can't go into the ladies room so he goes into the unisex bathroom.
It is a reasonable accommodation. It still gets complaints, but it is the only reasonable accommodation.