If or better yet when, you meet a trans person, regardless of how you personally feel about them, at least show them the same respect you would show for anyone else. That means addressing them by their preferred pro-nouns (he, she, they, them, it) and name (self-explanatory).
It's easy, and it'll make you look like a much better person.
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If you were born male, you'll be called a "he". If born a female, you'll be called a "she". If you consider yourself to be transgender, you won't be called either. In fact, you won't be spoken to unless absolutely necessary. I don't associate with that sort of handicap, nor do I accept it.