Ya, nothing wrong with that.
If a guy bitches about Movies, there is nothing wrong with saying he does not like movies. Even if he says he does while ignoring his bitching.
BJJ is part OF MMA and a big way to get the submission is to wear your opponent with non stop grappling to seek the sub. Unlike someone like prime BJ Penn who would wear you out with strikes and then get the sub. Many do not like seeing a fighter worn out with grappling. They find it boring (thus don't like a key element of MMA) and i get it. But lets not pretend you like all the elements of MMA. Had Maia spent most of 3 rounds exhausting Brown with body shots and boxing I doubt you would complain. But a fighter like Maia using grappling to exhaust and expose his opponent is somehow boring. But only if you do not appreciate the brilliance and technical strength of what Maia did.