Jorge Masvidal pulled up on Jake Paul outside his warehouse in Miami, Florida to add to the bad blood between the pair.
Former UFC welterweight title contender Masvidal has repeatedly criticised YouTuber-turned-boxer Paul, claiming he could easily defeat him in a fight.
In an interview with MMA Junkie in March, Masvidal was asked if a boxing match against Paul still interested him after the American's split decision loss to Tommy Fury.
"I always said it would be a great fight for me," said Masvidal, who retired from MMA in April following his loss to Gilbert Burns at UFC 287.
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"I could knock him out, and make a lot of easy money... but you know, that ship has sailed now that he does not have that 0.
"Maybe he comes back and gets a couple wins and stuff but that's probably the only dude."
A clip is now circulating on social of Masvidal confronting Paul outside his Betr warehouse in Miami, the city where the former UFC fighter hails from.
"Why are you trying to cause trouble?", Paul asks, after heading outside to speak to Masvidal.
Masvidal then responds: "Nah, it's my city."
"It's your city, so you own this right here? You've been saying a lot on Ariel Helwani's (show). You called me a punk b***h," replies Paul.
Masvidal then confirms: "I did."
There is the possibility that the altercation was staged to drum up interest in a fight between the pair.
Paul is due to box another former UFC fighter, Nate Diaz, on August 5 in Dallas, Texas.
But after being denied a Therapeutic Use Exemption to smoke weed, Diaz is now campaigning for the fight to be moved.
Along with a GIF of Homer Simpson fading into a cloud of marijuana smoke, Diaz tweeted: "We gonna have to move states."
Paul's camp, however, have made it clear that they won't be moving the fight in order to accommodate Diaz's smoking habits.
His manager, Nakisa Bidarian, tweeted through his management company: "Jake Paul vs Nate Diaz is in Dallas, Texas.
"Nothing is changing in terms of location/venue. Saturday, August 5, Paul vs. Diaz live on DAZN."
Topics: UFC, Boxing, Jake Paul, MMA, Jorge Masvidal
Rory O'Callaghan