Singer-songwriter Shooter Jennings has taken to his official Twitter page to bash "self-naming king douche" John Mayer for supposedly 'selling out'.

In a series of posts shared on the social networking site earlier today (November 1), the country music star wrote:

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

"And don't anybody say he's a great guitar player. Gary Clark Jr & @lukasnelson wipes their asses with this dude. That's enough, John Mayer. Sorry to sh*t talk. Lord knows not everybody likes my ass. But seeing that RS in my friggin bathroom & reading the narcissistic drivel..."

Following his outburst, Jennings has been retweeting angry messages from fans of Mayer's such as: "Who the hell is this attention seeker @ShooterJennings?? John freaking Mayer didn't get 7 Grammys for nothing. You disgusting piece of crap!"