I caught this thread title and had to hop in for a min. Hi to everyone here.
Personally I wouldn't worry about it. It's like someone calling you shorty when you're 6 foot tall. Or someone saying your hair is red when it's obviously red. Look at them like they've said something totally alien then shrug it off. If it doesn't apply to you then they're just shouting nonsense at you.
Now if thier words are true but hurtful then correct them. Let them know that you prefer a different term or that the subject is private. I realize that kids usually aren't going to back off but education is the only way they'll learn and maybe someday it'll sink in.