6. Floyd Mayweather Jr.
Hateful lowlight: Purportedly ducking Manny Pacquiao and flaunting his wealth
Floyd Mayweather, Jr. is the type to Instagram $100,000 cash on the passenger side seat of his Bugatti with the caption "toll money," and it's hard to make friends that way. Also, there's the perception that he's ducking Manny Pacquiao, which only makes his cocksure persona that much more unbearable. He's eight paternity suits, three probation violations, and a Nevada real estate crash away from being Chad Johnson. So if you can wait until 2021, there should be a bankruptcy hearing for you haters to revel in.