Thanks for the current responses. And I have some new-found anxiety, unfortunately. And there's some novel-like writing in my explanation, which may come off as strange, but I've been writing stories for a few years, so it's just my style.
So, I was watching the news and a story about a man causing disturbance in a Target due to trans rights in the bathrooms came on. I grunted, "Crazy conservatives." and my brother, who was sitting across me, said "What?"
I said, "Crazy conservatives."
He rolled his eyes and looked at the T.V. "I am deeply disturbed by trans people." he said, "But it's just a bathroom. Nobody's gonna bother you in there. No big deal."
I decided to ask him the question. I already knew he hated trans people, but I was curious. "Why do you hate trans people?"
"It's just not normal." he insisted.
"What if one of our family members was trans, then? Like me or (other brother's name)? How'd you react?" I asked.
He shrugged, then spoke. "Do you mean like, if you were born a boy but became a girl and I didn't know, or if you're a girl but want to be a boy?"
"I guess it doesn't matter, but I think me wanting to be a boy would make more sense. If I was born a boy, you'd probably already know." I replied, then asked again, "How'd you feel if I told you I wanted to live my life as a man?"
"Well, I'd still be deeply disturbed." he responded, "I don't think I'd be able to look at you the same again. You're my sister. You've always been that. It's just too weird to imagine you as my brother."
That made my heart drop. It made me think, if I start transitioning, like getting a haircut and binder, and he noticed, would he suspect me of being trans? Would he bully me? What if he found my binder if I got one? Sure, he's a cis-male, but I'm sure he'll know at least some things about bras and perhaps recognize (even if it's unlikely) that it's not a tank top or sports bra. He's had plenty of girlfriends with all different chest sizes. Hell, would my family catch me wearing a binder and wonder where my boobs went?
The experience opened up so many questions and new fears for me, it's not fun.