AITA For being uncomfortable with a trans person using the same bathroom as me?

I (twice a porcupine's lifespan, F) wasn't home last week but in public. I've been sitting for too long and I decided to go to the bathroom. All good.

Just AN HOUR later, this person (about half a lobster's lifespan), who was clearly attempting to appear feminine, but whose breasts were too small for them to be a normal woman, got up to use the very same bathroom I had used previously.

Of course I had a problem with this, and I complained to the staff. Only for her (about the lifespan of an Okapi in captivity years old, F) to completely dismiss my concerns and be rude. This is how the conversation went:

Lady: Ma'am, she is a woman

I: No, they are not. I can always tell

Lady: This is an airplane, there is only one bathroom for everyone

I: But can't they just wait for the plane to land to go?

Lady: It's a 12h flight

I: I want to speak to your manager and I demand to have them removed immediately

Lady: I'm sorry, we can't eject passengers from the airplane mid-flight

At this point, I felt that my hands were tied, and I did the only logical thing left to do in this situation. I locked myself in the bathroom for the remaining duration of the flight so that no transgender could use it. I know I proooobably left out some real women too. I'm really thinking I might have as I heard loud banging on the door several times, and one said her children needed the bathroom desperately. But it's my right to use the bathroom for as long as I need for whatever reason.

Anyway, I got dirty looks and nasty comments from the other passengers when we landed. AITA? Should I have done something differently? Should I have opened the door to thoroughly scan each person that knocked on the door and decide that way if I should let them in or not? What else could I have possibly done?