You can definitely be a fan of both and for very different reasons.
John Cena and me doing a Nintendo Switch commercial, together.
Anderson Silva and me during a meeting at the Electronic Entertainment Exposition.
UFC and MMA for that matter, showcase what martial artists from different backgrounds can do in a real fight, within a specific set of rules. We appreciate the athleticism, precision of strikes and impressive submissions, and the dedication it takes to get to that level.
In the case of WWE and pro wrestling in general, people watch it for more than just what happens in-ring. It’s the music, fireworks, pyrotechnics, celebrity guest appearances, comedic writing, scantily glad women, and of course...the “larger than life, superhero-esque” performance you see in ring.
People know how difficult it is to do a backflip, to military press a couple hundred pounds, to dive off a stage in a mosh pit and so forth. So when you see these men and women doing all of those things but on an even more grand level, crashing trough tables and so forth, it’s “different”.
WWE is the live performance version of action cartoons, video games, or comic books. The crowd that likes Dragon Ball Z, might find WWE fun, because of the costumes and characters. Everyone was a kid once, however, and some people as young fans of Street Fighter and whatnot just grew out of that type of entertainment and instead, appreciate just the pure martial arts aspect of live combat and thus became UFC fans.
I like UFC. I’m a life long martial arts practitioner. I teach MMA and Shotokan Karate. I also like WWE. I watched more in my youth, but still find it fun and really applaud the company on their anti-bullying campaigns, Make-a-Wish involvement, cancer fund contributions, etc.
Not everyone is a fan of both. But if you’re only a WWE fan, you probably just “don’t care for UFC”, but more often that not, I’ve seen that if you’re only a UFC fan, you probably “hate WWE”.
I don’t see a reason to hate either, but that’s just me.