Because it's Mayweather and fans these days treat the sport like it's American Idol and base their decisions on hating or liking a fighter based on how his "personality" is.

No matter who Mayweather fights, he's going to be leaps and bounds ahead of them in terms of skill. So no matter what, they'll find a reason to discredit the win. He's too big, then he's too fast, etc.

We just got to accept that no matter what he does, he'll be discredited by those who hate them. Haters are going to hate no matter what. It's no problem to me. I just laugh and watch him make their favorite fighters look stupid.