You’re not supposed to know, by design. The rules are ever changing, and therefore at some point, you will be wrong, without any malicious intent, but you will need to be punished. I’m sure you understand. The job market is pretty good right now, so it shouldn’t take long to find a new one.
Do try to keep up though, so you can virtue-signal how hip and on top of things you are with regard to the correct nomenclature. It separates us from those icky ignorant hick rubes in flyover Jesusland.
I was raised to say, “Yes, sir.” and “Yes, ma’am.”
I know I will be punished for that some day.
Once, at a restaurant, I was walking behind a server and I was trying to get their attention and I said, “Excuse me, ma’am!”, based on the clothing and hairstyle from the back (feminine). The server turned around and it was definitely a man dressed as a woman (he had a beard). I started stuttering lol. It turned out OK, but I could see that I could be fired at my job for doing the same thing. It’s coming.
When I was growing up it was just two, "he" and "she". Maybe three, if you threw in "it".
Where did the other 68 gender monikers come from? And who are these people?
Clerk: “If you were a woman I might call you ‘Sir’ just because you are so ugly.”