I mean, you do you as long as your not harming anyone or abusing animals, but if this is someone's kink, do they really have to publicly show it?
I'm not putting adult MLP fans down, not even bronies, as those are people mostly harmless, and I know it doesn't have to be a kink, just like furries. And even if it is a kink, so what as long as they know the limits?
(I mention furries because the brony fandom is essentially a satellite of the furry fandom. And that's ok.)