First Nelly called Floyd Mayweather a high school dropout. Then, 50 Cent mocked Mayweather's ability to read. Now rival boxer Manny Pacquiao is calling Mayweather uneducated.

"I think I finally understand him...what he says...how he acts...and I don’t like it," Pacquiao said in an interview with NJ.com. "But what l learned and heard from him, well, I realize why he is like that. I understand sometimes when the people are not educated they just talk to talk. He sets a very bad example." 

Those are definitely fighting words, although the chances of a Pacman-Mayweather fight seem slim, considering the two boxers were never able to gain traction on fight negotiations and secure the mega bout.

Pacquiao's jab at "Money" comes just a few weeks after former friend 'Fif took a swipe at the undefeated champion.

"We don't want to put pressure on you," 50 said. "We know you can't pronounce those words in that Harry Potter book, so we'll let you read Cat in the Hat."

Mayweather responded to 50 days later asking a fan, "Does he still make music?"

Mayweather is set to fight Marcos Maidana live on Showtime PPV on September 13. 

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(Photos from left: Harry How/Getty Images, Harry How/Getty Images)