[Coffee.]

Ask them the pronoun they want to be called. It differs from person to person. Sometimes, people prefer they or a nongender binding pronoun like ze. So ask the person individually, preferably in private where they do not have to feel embarrassed.

And this person is not weird. We, as cisgendered people, are privileged to feel okay with our sex and gender aligning. Not everybody is. Some people do not see themself in a binary of gender either, as neither male or female. So try to keep your own judgment and your own experience in your gender development out of the way you see another person. Keep an open mind.

And last, as non-trans* people, we have a lot of questions. Don't ask most of them, only ask the ones necessary for proper communication, such as pronouns and word preferences. Rule of thumb, if you wouldn't want t somebody the answer, (ex, "How do you have sex" or "What was your birth name"), don't ask it to somebody who is trans*. If they are comfortable telling you, they will.