I don't have a duty to explain myself in order to be treated with respect. Respect is a basic principle that should be offered to all people as long as it is returned. If I offer respect for you and your identity, you similarly need to offer respect for me and my identity, regardless of whether you understand or not. If you start from the position of "you are ridiculous, now I demand that you explain yourself so I can tell you that you are wrong," what possible incentive do I have to either explain myself, or to offer you respect in turn? You breached basic rules of etiquette. That's why you got down voted. Not because you don't understand.
I'm one of those ridiculous cupcakes (damn I love that expression, I think I'll steal it). I don't really have much in the way of a gender identity. Gender divisions don't really make much sense to me, and I struggle to believe that they are actual things. However, other people assert that gender is real and feel extremely strongly about it, so I respect them enough to take their word that it's a thing, and I just don't have it.
I live in a binary world where everyone is classified by gender, and that is super uncomfortable and depressing for me. My skin crawls every time I get called ma'am or lady or sir. I've learned to ignore it as best I can because that's all I can do. I dress low-key, in the most gender-neutral clothing available as a way of making myself feel a little easier in my skin. I deal with she pronouns, because I live as a female in this society, and we just aren't at a stage where I can get people to call me "they" and not feel like a fool. So it goes.
Oh... I was also assigned male at birth and transitioned: HRT, electrolysis, laser hair removal, forehead contouring, tracheal shave, rhinoplasty, and vaginoplasty. I'm among the more heavily modified humans on this forum. My dysphoria was intense enough that I downed a bottle of codeine pills when I was 17 in the hopes of not waking up, that I spent 9 years turning my forearms into a mass of scars.
You don't know anything about me. Don't make assumptions. Don't disrespect. And maybe you WILL learn something about the non-binaries in this community. Dude, I'm happy to learn about you and your story. To support you in your transition, to offer you respect. Why is it so hard to return the favour?