Mayweather Sr was particularly displeased by what he called "illegal punches" thrown by the reigning UFC lightweight champion, who had never boxed professionally before luring the 49-0 Mayweather out of retirement with the richest fight in history.
"All the illegal punches and stuff he did. . . you know, hitting in the back of the head. [McGregor] showed me no boxing."
McGregor, who bagged a reported $100 million from the fight, would put himself in danger if he decided to pursue a career in the ring, the 64-year-old Mayweather Sr told the website.
"If he keep [boxing] . . . somebody gonna kill him," he said.
"It all could be about the money with him, because he can't be about no glory ... because what he did was a failure."
And he doesn't want to see his son putting on the gloves again either, despite surpassing Rocky Marciano's record winning streak.
"No, man," Mayweather Sr said when asked if he would support his son coming out of retirement if another big payday presented itself.
"I would definitely have something to say about it.
"If he has another one, I don't think I'd be there."
