Ali used to **** talk Frazier (Uncle Tom, Gorilla, White Peoples Champ etc) many saw this is as a way to cover his fear of Frazier. Not sure if this correlates to Mayweather we'll only know when they get in the ring.
His nephew and protege is Manny's main rival and the only one who comes close to pipping his nephew in the boxing history books as the best of his generation? Roger loves his boxing history.