Am I an asshole?

To sum it all, I came out to my brother as being demiromantic and lithromantic. I also told him what they meant and he said lithromantic just sounds like I'm an asshole. Pretty much we got into a whole argument, he called me an asshole for being lithromantic, and i called him homophobic. Overall he made me feel shitty for being lithromantic

Am I an asshole for being lithromantic???