Keith Richards appears to be on a roll at the moment. Last month, the Rolling Stones guitarist called seminal Beatles album Sgt. Pepper’s Lonely Hearts Club Band a “mishmash of rubbish”, and he has another set of scathing thoughts to share. This time, not even fellow rock bands are safe.

“It sounds like a dull thud to me,” Richards said of rock music, in a recent interview with the New York Daily News. “For most bands, getting the syncopation is beyond them. It’s endless thudding away, with no bounce, no lift, no syncopation.”

Richards wasn’t quite finished. He went into more detail on the merit – or lack thereof – of heavy metal. “Millions are in love with Metallica and Black Sabbath,” he said. “I just thought they were great jokes.” Richards may be delighted to hear that Ozzy Osbourne and co are due to disband after they play their farewell tour next year, on a 24-date trip across North America, Australia and New Zealand.

With metal and rock checked off the list, Richards saved a few choice words for one last genre. “Rap: so many words, so little said. What rap did that was impressive was to show there are so many tone-deaf people out there,” he said. “All they need is a drum beat and somebody yelling over it, and they’re happy. There’s an enormous market for people who can’t tell one note from another.” In that case, Richards won’t be queuing up at the cinema to watch recent NWA biopic and box-office hit Straight Outta Compton.

Elsewhere in the interview, Richards spoke candidly about the Beatles (again) and his bandmate Mick Jagger. Richards’ first solo album in more than 20 years, Crosseyed Heart, is due out on 14 September and a Netflix documentary centred on his life is to be made available on 18 September.