HASIM RAHMAN JR revealed Jake Paul compared himself to Floyd Mayweather before their row after sparring.
Rahman shared five rounds with Paul in Las Vegas in preparation for the YouTuber-turned-boxer's second professional bout.
Fast forward two years and the pair have signed to fight for real, which caused the release of a heated exchange from their sparring.
Rahman is incensed in the clip posted by Paul and claimed he was verbally insulted after the session, causing his furious reaction.
He told SunSport: “He used the word "bitch". And I don’t play like that. You see he didn’t use it in the press conference.
“I believe that’s what it was over and it was when the sparring was done.
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"But I was telling him, ‘You don’t like it that I’m handicapped right now’.
“Because he was talking s*** while we were boxing like, ‘I’m better than Floyd Mayweather’. And I’m like, ‘What? Are you kidding me?’
“But it is what it is, August 6 I get to expose this clown.”
Much has been made of the sparring session at Bones Adams' Vegas gym.
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But Rahman claimed what Paul does not know is that he was specifically asked to hold himself back during the rounds.
That included being prohibited from turning southpaw and only using his lead hand.
Rahman said: “I was there to build his confidence, to have somebody for him to swing at and really not hurt him coming back, just a durable guy that’s going to be there.
“I know for a fact that his coaches aren’t telling him what they tell his sparring partners before they go in to spar him.
“I know they’re not, that would be counterproductive to what they’re trying to do. They’re trying to build his confidence.
“So they’re not going to tell him, ‘Hey, we’ve asked these pros not to go all out on you and to only go 35-40 per cent, maybe 50 per cent’.
“I boxed this man with one hand and I know he didn’t realise that.
"So when he goes back and watches the tape, he’s going to be like, ‘Oh wow, he really did use one hand’.
“And if I did switch southpaw, I only did for like five or ten seconds and I got an alert from his trainer or something to switch back.
“It wasn’t like I was actually boxing him or competing to win.
"When this guy across from me, with his training wheels on, is over here giving it his 100 per cent best.”
Paul sparred Rahman before his first two professional wins, over YouTuber "AnEsonGib" and ex-NBA star Nate Robinson, 38.
He later went on to beat former MMA champions Ben Askren, 37, and Tyron Woodley, 40.
He was then due to fight Tommy Fury at New York's famed Madison Square Garden.
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But again Fury, 23, was forced to be withdrawn amid a US visa issue, having last year pulled out with a rib injury.
Rahman, 31, agreed to step in on late notice and signed to fight Paul in a 14st 4lb cruiserweight bout over eight rounds.
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