We do. The female maybe in the stall but here is the difference. Boys can not contain a clean restroom. Women do so why mix? It was cause mischief. The men and the women in love would do things in the restroom not meant to do. The women would have to be in a restroom with oters. Yes they can cause smells two, but they use spray. Men are naturally messy.
This is not about having a bathroom clean. I assume you are a woman so I will ask this. Would you not be freaked out if a man dressed like a woman comes into a stall next to you and has man parts. Switching a gender is a mental disorder, not a condition. If you look like a man, go in the men's, if you look like a girl go in the ladies.