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McGregor was stopped in the second round by Dustin Poirier in the UFC 257 main event at the Etihad Arena and the shock result saw 'The Notorious' drop to sixth in the lightweight ranks.
Gaethje, who lost to Khabib Nurmagomedov at UFC 254 in what may be his final fight unless he reverses his retirement decision, very much enjoyed it.
"I don't feel bad for him, I'm happy for Poirier, I'm happy Poirier went out there did his job, and finished him," Gaethje said in an interview with ESPN.
"I love seeing a loudmouth get knocked out, there is nothing that makes me happier. Seeing a piece of s**t get put down, that was great, I loved it."
With the pair 1-1 in their series and both McGregor and his team have made it clear they want a trilogy fight with Poirier.
His coach, John Kavanagh, has even suggested making it for the vacant lightweight strap if Khabib is indeed retired.
But Gaethje is not having it one bit and even went as far as saying he would walk away from the Octagon if McGregor is granted a title shot despite his recent loss.
"For him to come out and say he wants a title shot next in a rematch with Poirier, or his coach, they are f*****g idiots," 'The Highlight' continued.
"He has been treated special over and over and over and he didn't capitalize on this opportunity. That event was for him, that event was for him to win. He wants to be Mr. Humble now but you know he would be an a**hole if he won that fight.
"He's not fighting for a title. I will think about never fighting in the UFC again if he fights for a title.
"That would be preposterous. He's sitting at number six, he's won one fight in his entire life in the lightweight division. He picks and chooses who he fights. I would love to fight him but I don't think it should be next. But he ain't gonna fight me."
Gaethje and McGregor have had a back-and-forth in the past, with the 32-year-old calling him out for a fight over DM and branding him "a "s**t human, father, and husband".
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