I believe it happened, but I do have some sympathy with celebrities, who must be polite and happy to see fans at any given moment in any given day. Sometimes it must get on their nerves and they are human.
The same Paul McCartney who is still touring to sell out gigs around the world? I saw him 12 years ago, he was on stage for over two hours, sometimes completely on his own with just an acoustic guitar. He was excellent.
I laugh when people quote the Frog Chorus in an attempt to put Paul down. The Beatles also wrote children's songs, Octopus' Garden and Yellow Submarine for example.
They were all talented musicians, and the sum of the whole exceeded the individual parts. I liked John but felt he lost his way...