Even if the looks are not there yet people should still try their best but in those cases I can at least understand how slip ups happen.
But if someone also looks the part and everyone else had years to adjust it shouldn't even be hard.
I never am afraid to be misgendered or read when I'm out with friends or by myself. with a few members of my family it happens quite a lot. It creates uncomfortable moments not only for me, but them and if we are at a restaurant for the wait stuff as well.
So now I drill them, but more often don't go out with them.