McGregor changed the landscape of the UFC because he became their first true mainstream superstar. The former two-weight champion is an electric personality but he isn’t always a good human. This especially came true after he fought Floyd Mayweather in a farcical but incredibly lucrative boxing match in August 2017. He behaved badly in the real world many times but the worst moment came when he punched an older man in a bar. The man refused to drink a shot of McGregor’s Proper Twelve whiskey.
This turned many people against the Irishman. He committed many offenses throughout his career. It’s also worth pointing out that the New York Times revealed that police investigated him for sexual assault. There were no legal consequences but these allegations continue to rise their heads (via TMZ).