Former UFC champion Conor McGregor heard comments made by long-time MMA trainer Firas Zahabi recently. And “Notorious” was none-too-happy with them.

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Zahabi was asked about his thoughts if McGregor and UFC featherweight champion Max Holloway were to have a rematch of their 2014 encounter. McGregor one that via decision, and Holloway has not lost since.

“If I had to pick Max Holloway vs. Conor McGregor today, I would pick Max Holloway,” Zahabi said (thanks to MMA Fighting for transcribing). “Why? When they fought the first time, for those of you who don’t know, McGregor won an easy three rounds. McGregor out struck Holloway in the first two rounds and then in the third round he out grappled Holloway. In the second or third round, McGregor tears his ACL, so he goes heavy grappling and he even shows that he can out grapple Holloway.”

McGregor, though, didn’t seem to agree.

“Hey firaz,” he wrote on Twitter. “Young man afraid to get in and fight, himself. Stop talking about me like you know me, you twerp.

“You are what age? Why are you not in there yourself? Are you not up to it? You rent dorms and hit a clock for a living. Shut your pie, kid.”