NATE DIAZ called Dustin Poirier a 'lil bitch' after snubbing him to instead fight Conor McGregor in a trilogy.
Poirier knocked out McGregor in January and afterwards revealed he was interested in a welterweight headliner with Diaz.
But UFC president Dana White announced plans for an immediate rematch in the summer with talks progressing.
It left Diaz – who beat McGregor in 2016 but lost the second fight five months later – taking aim at Poirier online.
He posted: "Don’t forget who started this G s***.
"The real uncrowned King. No rematches ever given. Dustin you do what your (sic) told by your daddies u lil bitch."
Poirier responded: "You lost the rematch Nathan. 1 was given lol."
The pair have a history dating back to 2018 when they were meant to co-headlined UFC 230.
But Poirier pulled out injured and the rivalry has since gone unsettled.
Diaz, 35, confirmed he wants to fight again but has no interest in returning to 155lb, despite calling out lightweights Poirier and Charles Oliveira, 31.
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The American is yet to receive the chance to decide his series with McGregor, now four years on from their UFC 202 thriller.
But Diaz has questioned why the Irishman, who has been stopped by Khabib Nurmagomedov, 32, and Poirier, is the recipient of rematches.
He told ESPN: "So why was it so out of the question for me to have a rematch with someone? You know?
"This guy gets finished by me, he gets a rematch. He gets finished by Khabib, they're trying to give him the [rematch].
"The whole fight off of this, Dustin Poirier for a rematch, was for him and Khabib.
"And then he lost to him and they're talking about a rematch. This guy just gets rematches [all the time]. That's crazy."
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