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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I have a transgender friend, it was awkward calling him by his preferred pronoun at first; but I got used to it. If you are a trans person reading this, give us cisgender folks time to adjust. Just an FYI, calling a transgender "it" is offensive. So if you know a trans person you wish to stay on good terms with, now you know. On the flip side, now you have a word to express trans prejudice with.