McGregor exploded on his former UFC rival, aiming a sickening message at Nurmagomedov's late father who tragically passed away last year.
The Irishman tweeted then deleted: "Covid is good and father is evil?"
Nurmagomedov's longtime coach Javier Mendez has now shared his thoughts on McGregor's social media antics - and he's pulled no punches, calling him a 'flat out idiot' while claiming he's 'out of control'.
Speaking on Mike Swick's podcast, he said: "He's got all the money. But he doesn't have the one thing he used to have: The respect of the whole world as a fighter.
"Maybe he's angry because he doesn't have that anymore. I just know he should have never texted those words, ever.
"Who should like him for a comment like that? How many people do you know, lost their family, lost their business, lost everything because of COVID, and you make fun of it? You say COVID good, father evil? Are you kidding me?"
Mendez added: "So you're saying to all those poor people that lost their family, lost their business, people that committed suicide over this tragedy that's happened to the whole world, and you think you're making a mockery of it by trying attack someone's father by using that? You're an idiot. You are an idiot.
"It's just another knife to dig in people's hearts. He's an idiot. He's flat out an idiot, and he's out of control. I'm sorry.
"And this has nothing to do with Khabib's father. This has nothing to do with those comments on COVID. We already know what he thinks on Khabib.
"That's fine. But you make a comment like that, all the money in the world isn't going to allow you to get away with some of the stupid things you say."
Nurmagomedov also responded to McGregor's vile taunt, saying only an 'evil' person could target someone's father, wife, kids or religion.
Featured Image Credit: PA/Twitter
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