Just a few days before his show moves to the coveted 11:35pm ET slot, it has come to light that Jimmy Kimmel slammed Leno in a Rolling Stone interview, the Daily Mail reports. In the interview, during which Kimmel is reportedly smoking blunts with the magazine’s reporter, he gives Jay Leno a hell of a verbal pasting.

“Leno hasn’t been a good stand-up in 20 years,” says Kimmel, who continues “as a comedian, you can’t not have disdain for what he’s done. He totally sold out." Kimmel’s show will go head to head with Jay Leno once it moves time slots but Kimmel reckons’ Leno’s days are pretty much numbered. “Jay Leno is not going to be able to stay in television forever and obviously, Jimmy Fallon is doing a great job, so it makes sense people would talk like this.”

When he was done laying into his rival, though, Kimmel showed his positive side and had nothing but praise for his other talk show rival, David Letterman. Speaking of his childhood idol, he said “If I beat David Letterman in the ratings, does that mean I’m better than Letterman? No f***ing way.” He continued “People are going to compare me and him for years to come — we’re being positioned as the Leno and Letterman of the next round,' Kimmel reportedly said. 'I like it because he’s a very worthy competitor.”