Outdated standards going out the window is a good thing.
Restricting how you present yourself depending only upon your gender is very 20th century. The world has moved on. If it’s okay for a woman to do it, so should a man, and vice-versa. Gender equality has still a long way to go, but things need to cut both ways.
If someone has a problem with a man wearing long hair or a special manicure, then perhaps they should not be taking public transport in the first place.