Patrick Carney

Justin Bieber isn't taking too kindly to being told he doesn't deserve a Grammy -- going after the Black Keys drummer who insulted him ... saying, the drummer "should be slapped around." Bieber added "haha" at the end of his statement -- which he posted on Twitter -- like he was joking. TMZ broke…

Justin Bieber has no business winning Grammys -- at least according to a guy who cleaned up at the award show last night ... Patrick Carney from The Black Keys. Patrick was swarmed by fans outside Chateau Marmont when we asked if Bieber should feel snubbed -- seeing as how he didn't get a single…