Floyd Mayweather is the highest-paid athlete in the world, so it shouldn't be any surprise that Mayweather expects everyone to recognize him. That includes complete strangers in London.
(Warning: this video contains profanity.)
Random stranger: I don't know you, so whats the big deal?
Floyd Mayweather: You got television?
Mayweather would not accept that this woman simply didn't know him.
RS: I know about Mike Tyson. I like big fights, I like exciting fights. Hes not big at all!
Mayweather then [pretended?] not to know who Usain Bolt is.
RS: I know Usain Bolt
RS: The runner