[Frondo]

I'm not trans but have several trans friends, and just wanted to add (as a non-trans person), make a best guess for how someone presents and if they correct you, do not joke about it. No jokes, no extra comments, Just say, "sorry, got it," and move on. It's a matter of respect and nothing more, and if you respect someone, it's easy to show it. Making a joke about something that's important (and possibly sensitive) to someone is just a bad start.

[pistacchioman]

I don't think it's necessary to be so careful. If they can't take a joke I don't wanna hang out with them.