Shooter Jennings and Drea Matteo.

Katy Perry's boyfriend John mayer doesn't appear to have a fan in Shooter Jennings and the country rocker used Twitter to speak his mind in a few separate posts today.

Jennings tweeted:

"That's enough, John Mayer.

...And don't anybody say he's a great guitar player. Gary Clark Jr & Lukas Nelson wipes their a***s with this dude.

He adds, "Claims he's "done w Hollywood game" and has "roots" and then immediately cuts hair, goes back to Hollywood clubs and starts banging Katy Perry."

And the kicker…

'I love how the "Neil Young of our generation" self-naming king douche grows his hair out + buys a place in Montana just to do RS article.'

Should John Mayer answer back?

His last tweet was on October 25.

(Image: WENN)