Because it would be safer
https://www.newsweek.com/trans-man-attacked-using-womens-restroom-ohio-1723432
Yes, I know this is 2 years old.
"So we respected his wishes and did as he asked," Ruiz added, noting the irony of the violence that later occurred as a result. After the woman accused him of being a man, people outside the bathroom became involved.
"The men thought I was a cis man [a man who was born male] trying to be in the women's [restroom]," he said. "After I clarified I am transgender, they continued to call me a 'f**' and insisted I was male-to-female when I am in fact female-to-male. They yelled slurs and disagreed with the fact of me being transgender throughout the rest of the incident and continued to physically attack me while screaming slurs."
https://card.psnprofiles.com/1/NIR_Hockey.png
she/her