Professional fighter Nate Diaz and pop singer Justin Bieber are now feuding

Is it too late now to say sorry?

After disposing of Conor McGregor at UFC 196, Nate Diaz is now moving on to a new public feud—with pop singer Justin Bieber.

Biebs called Diaz’s style “terrible” in an Instagram post over the weekend, which seemed to upset the fighter.

Diaz shot back on Tuesday by posting a drawing of him slapping Bieber right in the face, yelling “Shut your b---- ass up!!!!!”

“Biebers a hater,” Diaz wrote in the caption.

Warning: This post contains graphic language.

Bieber should let this one go—Nate is one dangerous dude.

Brandon Magnus/Zuffa LLC via Getty Images; Edit by Kenny Ducey

Is it too late now to say sorry?

– Kenny Ducey