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Floyd Mayweather has hit back at Manny Pacquiao after his demand for a rematch. Pacquiao inflicted a first defeat on Keith Thurman last weekend to enhance his legacy at the age of 40.

His victory immediately led to calls for a second fight with Mayweather, four years after the American comfortably outpointed his long-time rival.

Pacquiao himself called out the 50-0 retired fighter, before Mayweather responded with a lengthy Instagram post.

"I find it real ironic how every time Pacquiao's name is brought up in the media, my name is always attached to it," he wrote.

"This man's entire legacy and career has been built off its association with my name and it's about time you all stop using my brand for clout chasing and clickbait and let that man's name hold weight of its own."For years, all you heard was that 'Floyd is afraid of Manny Pacquiao,' but what's funny is, when we finally fought, I won so easily that everyone had to eat their words!

"All of the so called boxing experts, critics and jealous American 'fan base' either went mute and ran for cover or made every excuse in the world as to why I should give Manny Pacquiao a rematch.

"My take on all this bulls*** is that y’all are just upset that I broke Rocky Marciano's record and hate the fact that a black, high school dropout outsmarted you all by beating all odds and retiring undefeated while maintaining all my faculties simply by making smart choices and even smarter investments.

"Ultimately, I will always have the last laugh."Mayweather was ringside to see Pacquiao beat Thurman, but insisted he was there simply as his 'boss' after Pacquiao signed with adviser Al Haymon.

"Let's stick to the facts! Bob Arum is no longer your promoter, so when it comes to Mayweather Promotions and PBC events I’m the HNIC (Head Narcissist in Charge)!" he continued."Bottom line, I make more money than you; I beat you, then I signed you! I was only at your fight supervising you, my employee, as any real BOSS would do.

"You made $10million for 12 rounds, when I just made $9m in under three minutes playing around in an exhibition with a pizza delivery guy!

"I beat you mentally, physically and financially! Remember, you fight cause you have to, I fight when I want to!"