"He's made more money than he could ever spend. He's made true, like, generational wealth. Like, his kids' kids' kids' kids are going to be just fine because of the things that Conor's accomplished.
"What Conor can never get back, is he'll never be one of us again, and it drives him absolutely crazy."
The 33-year-old McGregor has endured a tumultuous time since suffering a broken leg and stoppage loss to Dustin Poirier in the summer — his second of the year having been knocked out by the American in January.
Away from the UFC Octagon and away from Twitter, McGregor appears to enjoy the trappings of his success.
He posts photos of his frequent lavish vacations on Instagram, he walks red carpets, drives fancy cars, and has befriended celebrities like Drake, whose recent album-release party he attended.
But this, Smith says, puts him at odds with the vast majority of fighters.
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McGregor, a worldwide celebrity, may miss just being one of the guys, Smith said
Smith said McGregor "alienated" himself from "everybody" on the UFC roster.
"I've been around him, and he was one of the guys, and he kind of sold out, and he starts taking shots at people, and he kind of sold his soul for all that money. And that's fine if that's what you want to do."
He continued: "He'll never fit in in our group. He's not one of our peers anymore. And it's not because we kicked him out and didn't want him. It's the total opposite.
"We wanted Conor to be one of us, and he alienated all of us, and now he wants back in and we're not going to let him in because he shit on every single one of us.
"It's the comments he makes. He wants the whole world to think that he's the cool guy and we're not, when in all reality, in our, like, private situations and in our small world, he's the outsider.
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"He's the one that no one's letting back in."
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