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UFC superstar McGregor, 31, took to social media only hours after UFC 250 to announce his third MMA retirement in the space of four years.
But Gaethje, who stunned the MMA world by beating Tony Ferguson at UFC 249 last month, has pulled no punches towards the 'Notorious.'
The 31-year-old American fighter tweeted: "Thankfully all of the elderly are still hiding in their homes.
"This guy is on another bender #propershit #ByeFelicia. Great fights tonight Cody No love with the performance of the night."
Interim UFC lightweight champ Gaethje is referring to the controversial incident where McGregor was involved in an altercation with an elderly man in a Dublin pub.
Gaethje and McGregor have traded verbal blows in the past and their heated rivalry has escalated in recent months.
McGregor launched an extraordinary rant against the likes of Ferguson, Khabib Nurmagomedov, Dustin Poirier and Gaethje last month.
During the callout, the MMA superstar astonishingly threatened to "f*****g butcher" Gaethje and knock his teeth out and turn them into a necklace.
Gaethje hit back at McGregor in style by posting a video of the times he called him out for a fight and warned the Irishman that he was 'losing his clout.'
The 'Highlight' has punched his ticket to face McGregor's rival Khabib after winning the interim UFC lightweight championship.
But Gaethje admitted in 2019 that he dreamed of facing McGregor in Ireland and would have knocked him out in a fight.
He told TMZ: "[Conor's] a warrior. I know that it would intrigue him for sure. But, I also think his mind would be like, 'No, thank you.'
"He can't take my leg kicks. If I wanted to wrestle him, I could wrestle him all day. And, I could knock him out. The last thing he needs to be is f*****g on his back reaching for the sky and I will, I could do that to him.
"[...] I wanna fight [Conor]. I wanna fight him in Ireland. I know it's not gonna happen in Ireland, but that's my dream. To go over there and be in that sorta chaos. That's what f*****g wakes me up every day."
Featured Image Credit: ESPN/PA
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