Yeah shaming what people like in fiction is annoying as fuck and I say this as someone who rarely cares about top/bottom dynamics for my ships. I'm happy to read whatever so long as it feels in character, but the way I've seen people get so nasty at anyone who happens to have a preference is weird as shit.

So long as no one is harassing someone else over what they like I do not care if someone has a strict preference and only reads/writes that preference, it's fucking fanfic for gods sake, it's really not that important.