Because more segregation is always the answer. The world will never be perfect until every business has a water fountain for each:

• a rich straight male white brunette curly-haired right-handed hazel-eyed Christian water fountain
• a middle-class trans white brunette curly-haired right-handed blue-eyed atheist water fountain
• a poor straight male white brunette curly-haired left-handed green-eyed Muslim water fountain
• a rich straight female white brunette curly-haired right-handed hazel-eyed atheist water fountain,…

and a water fountain for every other of the 680,400+ permutations of common segregating category combinations. If I don’t have to walk through a shopping mall’s worth of water fountains and bathrooms to find mine, it’s not segregated enough!

(/sarcasm)

The bathroom in your home is unisex. Most businesses with only one restroom are unisex. The simple solution is to *gasp* stop segregation.