If you can't differentiate between the penis that did you wrong and the penis of some poor person just going about her life, then the issue is with you, not with the trans woman accessing services.
How do you tell?
This is the Majingilane coalition on territorial patrol.
If I told you three of them were friendly to humans, but the fourth one would attack you, and you can’t tell which is which, are you going to get out of the car? What if you’ve been mauled by a lion previously? Are you going to feel safe if there's just one lion on the road?
Of course not; you can’t tell by looking which are the safe lions. You’re going to stay in the car.
What if you walked into a room and there was a lion in it? Might be one of the friendly lions, but you can’t tell, so of course you feel in danger.
If any of us could easily identify the men who would hurt us, many of us could have avoided being hurt.