Change My View?

So I have a dilemna. I am a young Trans person and have recently joined a Trans social group at my college. Before that I didn't know anything about non binary Trans people.

But I learned, and I accepted it because it makes sense. There is a spectrum and you could be man, woman, somewhere in between, or not on it at all. This is all logical.

But recently an old group member came back and he has been boggling my mind and I just don't understand.

He was assigned female at birth. Claims he is trans. And says that he is a man. That's completely fine, obviously, but what confuses me is that he doesn't plan on transitioning at all, not even socially. He still wears dresses and makeup and there's just no way you could know he is not a cis girl.

At first I thought he could he be an agendered or gender fluid person who prefers the he pronouns, but when I asked him he distastefully responded with no I am a man. Like it was weird to be non binary.

Anyways, I just don't get it and It doesn't help that he is kind of a dick too. It just seems like he is mocking all of us at the group by pretended to be trans. I'm probably wrong though, but he agitates me and I know that's not right.

CMV, please? I don't want to be an oppressor, especially to those in my own community.