Maybe someone else was unaware of the other's desired gender. Maybe they don't accept the idea that people get to choose their own gender. The expression of different cultural norms is not necessarily harassment.

> Maybe someone else was unaware of the other's desired gender

Then it wasn’t purposefully doing it, so I’m not sure how it’s relevant to my question

> Maybe they don’t accept the idea that

Plenty of people don’t accept the idea that men and women should be accepted equally, or that you can’t ban black people from living in your apartment, or that men who have sex with other men need to be put to death. That you’ve drawn an arbitrary line doesn’t privilege your line.

People don't get to choose their own gender, they get to choose their own gender expression. Freedom of expression (to some greater extent) is quite popular in most societies. No-one's complaining about good-faith mistakes, but if we could arrange for those mistakes to be very difficult to make then so much the better.