They were best friends. Then The Beatles split up and the two of them kind of argued through the press for a while. But in '74 they got close again and even had a jam session together. After that, they kind of drifted apart again, but weren't especially brash towards each other anymore.

And I know, I had the same reaction when I came to the realization. I was like "........ohgod. NO. I HAVE SPENT YEARS HATING ON BANDOMS.. and now this.."