After Cooper rose to fame himself, he got to know The Beatles. Their breakup was messy and painful for the former bandmates. Lennon and McCartney insulted each other’s music and behavior. Still, Cooper said they never allowed others to speak badly about the band. Lennon would go so far as to try to fight people who insulted McCartney.
“Here’s the thing about them,” he said, per iHeartRadio. “When they were after each other’s throats, when it came to the breakup and all that stuff, if anybody in the Vampires back in those days – that was our drinking club – if anybody said anything bad about Paul, John would take a swing at you, because that was his best friend.”
Source: Emma McKee/cheatsheet.com