"It's every band's right, you shouldn't have to do f--king Glee," Grohl tells the Hollywood Reporter following the SXSW premiere of the band's new documentary, Foo Fighters: Back and Forth. "And then the guy who created Glee is so offended that we're not, like, begging to be on his f--king show...f---k that guy for thinking anybody and everybody should want to do Glee."

Grohl then went on a Murphy tear.

"The Glee guy, what a f--king jerk. Slash was the first one. He wanted to do Guns N' Roses, and Slash is like 'I f---ing hate musicals. It's worse than Grease.' Then [Murphy's] like, 'Well of course he'd say that, he's a washed up ol' rock star, that's what they f---ing do.' And then Kings of Leon say, 'No, we don't want to be on your show.' And then he's like, 'Snotty little assholes...' And it's just like, 'Dude, maybe not everyone loves Glee.' Me included."

So tell us how you really feel.

Bandmate Taylor Hawkins chimed in with a simple, "Yeah, f--k that s--t."

Grohl's not taking aim at the show for no reason—he even admits to watching it himself. Well, once. For barely an episode.

"I watched 10 minutes," he confesses. "It's not my thing."

Murphy has become something of an 800-pound gorilla in the music biz, with Glee covers of hit pop tracks generating huge sales. But he hasn't endeared himself to some top-flight acts.

KOL had actually passed (pretty politely at first) saying the band has a policy not to sell their songs for use in TV series and advertisements.

To which Murphy shot back: ""F--k you, Kings of Leon. They're self-centered assholes and they missed the big picture."

As for Slash's comparison to Grease, Murphy had this to say:

"Usually I find that people who make those comments, their careers are over; they're uneducated and quite stupid." Ouch.

Hmm, maybe Grohl does have a point?