I have to call you out here, you are WAY off base. Generalizing to the point you are is an act prone to fail, and I am the proof. I'm a fan of Conor McGregor because he's a knockout artist. The best knockout artist our sport MMA has to offer imho. He's exciting. And he's damn good at what he does. He makes people care. I don't see what's not to like. I do see many jealous people though. Jealous of the double champion.
To say fans of McGregor's "don't have enough concentration to pay attention to the rest of the sport" is such a dumb statement it's hard to even understand your point here. Yes, shockingly enough to you, some Conor McGregor fans... like myself... pay very close attention to the sport.