"It's frickin' [r-word], man. So stupid," Busch said of Keselowski. "I don't understand these guys. I should beat the s*** out of him right now, is what I should do."
"But, that doesn't do me any good, either."
Busch apologized for the remark hours after the race ... saying in a statement on his social media page, "I used a word I should never use and I want to apologize for it."
This is the second time in the last year NASCAR officials have punished a driver for using the word ... Hailie Deegan was also ordered to undergo sensitivity training after she used the term during a virtual race in 2021.