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McGregor exploded on Poirier and his family after suffering a doctor's stoppage in the main-event of their trilogy bout.
He said he was going to 'murder' Poirier and took aim at his wife, Jolie, who reacted angrily inside the Octagon.
The Irishman's post-fight interview has not been received well, with Felder the latest UFC personality to blast his comments towards 'The Diamond'.
He said via MMA Fighting: "You're on the ground with your leg broken in half at the bottom, threatening to kill somebody, to a man who has just dominated you twice in a row now, he could walk up and soccer kick you in the mouth, knock all your teeth out and leave you for dead on that canvas.
"You're the one who is in position to get killed, Conor, in that spot."
Felder continued by urging McGregor to show some 'humility' and told him to leave those things out or get out of the Octagon.
"Show some humility. Listen, this sport is violent," he added. "I get that. We're supposed to beat the crap out of each other, knock each other out. But at the end of the day, it's not about murder. It's not about your family. Leave those things out of your mouth, or get the hell out of the octagon, I never want to see you again.
"It's not a street fight, it's not life and death.
"Obviously, in boxing and MMA, there's injuries that cause people to literally die. So, to talk about that stuff, to talk about that kind of stuff is just disgusting and we've mentioned that a million times. What he said was wrong."
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