The only difference is that Tyson was a certified G and nutjob. Like, if Tyson started talking shit to me, I'd shit my pants and run. If McGregor started talking shit to me, I'd tell him to fuck off. He'd beat me senseless, but McGregor has nowhere near that aura Tyson had, he doesn't command that kind of fear or respect. Tyson was a violent psychopath who would kill or rape without a second thought (and also a HW), McGregor is just an overgrown child who happens to be a good fighter but doesn't want to fight real competition. Hell, I'd say Valero was scarier than McGregor is.