HASIM RAHMAN JR revealed Jake Paul likened himself to Floyd Mayweather, before they started to row after sparring.
In Las Vegas, Rahman and Paul shared five rounds in preparation for Paul's second professional bout.
Jake Paul fought twice with Hasim Rahman Jr.
Two years later, the pair has signed to fight for real. This sparked an intense exchange that resulted in their sparring being released.
Rahman, who can be seen in a clip posted by Paul incensed, claims he was verbally insulted following the session. This caused his furious reaction.
SunSport reported that he used the term "bitch" to describe his actions. He said, "He used the word "bitch". I don't like it. It was not used in his press conference.
"I believe that was what it was and it was when it ended.
"But I was telling he, 'You don’t like it because I’m handicapped right now.
"Because his talk was s*** while we boxed like, I'm better that Floyd Mayweather'. And I was like, "What?" Is that you kidding me?
"But it's what it is, August 6th is when I get to expose this clown."
Bones Adams' Vegas gym has seen sparring sessions made a lot of media attention.
Rahman said that Paul did not know that he was asked to keep his hands off during rounds.
This included the prohibition of turning his southpaw to use only his lead hand.
Rahman stated that he was there to help him build his confidence and to give him someone to play at.
"I am certain that his coaches don't tell him what they tell him before sparring him.
"I know that they are not, but that would be counterproductive to their efforts. They are trying to increase his confidence.
"So they won't tell him, "Hey, we have asked these pros to not go all out and go only 35-40%, maybe 50%."
"I boxed him with one hand, and I don't think he realized that."
"So when he watches the tape again, he will be amazed that he actually used one hand."
"And if he did not switch southpaw, it was only for five to ten seconds before he alerted me or gave me a signal to change back.
"It wasn’t like I was boxing him or trying to win.
"When the guy directly across from me is wearing his training wheels, he's over here giving his 100 percent best."
Before his two first professional wins, Paul faced Rahman, defeating YouTuber "AnEsonGib", and Nate Robinson (38).
Later, he defeated former MMA champions Tyron Woodley, 41, and Ben Askren, 37.
The fight was to take place at New York's Madison Square Garden.
Fury, now 23, had to be pulled from the US visa issue. She was previously expelled last year after suffering a rib injury.
Rahman, 31 years old, agreed to take over on late notice and sign to fight Paul in a 14st 4lb bout over eight rounds.
Jake Paul vs Hasim Rahman Jr on August 6
