Dissed by the drummer from The Black Keys at the Grammy Awards, my man Justin Bieber fired off a tweet-spat.

“The black keys drummer should be slapped around haha” Bieber wrote.

Justin Bieber in the video for Boyfriend

Seems the drummer, Patrick Carney, suggested JB shouldn’t be bummed about not getting a Grammy nom. Again.

“He’s rich, right?” the drummer told TMZ. “Grammys are for, like, music. Not for money. And he’s making a lot of money. He should be happy.”

To which JB set Carney the bitch-slapping tweet, as payback.

N’ now Justin’s fans are firing up the feud, after Carney took the tweet-wars a step further — changing his Twitter name to “Justin Bieber,” hijacking JB’s profile for a few hours with a fake account that read “official twitter for the actual verified Justin Bieber DOS virtual buddy.”

Beliebers then went ballistic.

They bombarded Carney’s fake account with hate, tweeting insults and homophobic slurs at the dimwitted drummer.

“Maybe patrick carney’s gay, and this is his way of coming out,” tweeted one JB fan.

“Does patrick carney even realize how much of a faggot he looks,” tweeted another.

“@patrickcarney it’s really sad how ugly old and pathetic you are,” posted a third Belieber. “You have to pretend to be Justin just to feel good about your self.”

“Do you even know how stupid and immature u look doing this,” tweeted another user. “Aren’t u like fifty?”

“@patrickcarney,” wrote another, “I hope you get hit by a bus!”

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