I don't think anyone denies his greatness as a fighter. But I can't cheer for him because I don't wish success on people who are trying to pass off a fake persona as a real one, and do awful shit that is against my values.
Some are more willing to look past those gaping imperfections just so they can bask in it. Some people don't put up with it no matter how great an athlete is.
Mike Tyson was a huge fan favorite and still seems to be loved, and he's a fucking rapist and a woman beater among other bad things.
Different strokes for different folks, some will be happy as long as they keep getting that fictional glory by association they think they are getting by standing by a douche who keeps on winning. Some people (me included) can recognize the dominance but still wish those people to go away because they can't cheer for someone like that.