Yeah I'd be quite uncomfortable with calling anyone "it". I'll gladly use they/them, I'd be down to learn some neopronouns, but calling someone "it" is something I'd rather avoid. Even if someone likes "it" pronouns, I'd still feel incredibly weird doing so in public. Calling people an "it" is often done here to mock androgynous people. It feels dehumanizing. If I were to do so in public, it would mean they people around me (who don't know the other person's preference) would probably assume I'm doing so to mock them.

I have friends who use "it". It feels kind of weird and wrong for me as if I'm objectifying it but if that's what it wants it's what it gets.

ftfy

To me "it" dehumanises someone doen to an object.