John was indicating, without saying it, that Paul was the best drummer in the group.
It’s my guess that John was not being serious, but being a funny, sarcastic, smart-ass like he often was. (RIP).
A Word About Ringo Starr’s Drumming...
https://www.youtube.com/watch?v=-AGPm_-DtEQ
Ringo Starr Shows How to play Ticket to Ride, Come Together and Back off Boogaloo
https://www.youtube.com/watch?v=vl9188EPdLI