Conor McGregor
Many people would argue that McGregor is a humble loser but that’s not true. Yes, he paid respect to the likes of Floyd Mayweather and Nate Diaz after their victories. But a glance at his Twitter feed reveals his bad sportsmanship. He famously refuses to accept his losses to the point of delusion.

This saw him go back and forth with several rivals including Dustin Poirier and Khabib Nurmagamedov. He often takes things too far and uses racial insults or insults from their partners. It’s not pleasant and leaves a bad taste in many people’s mouths. But McGregor lives on the edge and isn’t going to change (via USA Today Sports).