Why Pink Floyd's Roger Waters was disappointed when he met John Lennon?

The day Pink Floyd met The Beatles.

Why Pink Floyd's Roger Waters was disappointed when he met John Lennon?
Former Pink Floyd bassist and singer Roger Waters Speaks on John Lennon Regret, Says Beatles Icon Acted 'Quite Snotty When They Met.

Did You Know: Pink Floyd’s Piper & Beatles’ Sgt Pepper’s Were Recorded in the Same Studio at the Same Time

Roger Waters:
I think John Lennon’s first solo album will always be in my top five. Neil Young is a big favorite of mine. His performance in that film was stunning. I think a great singer-songwriter is the best part of the musical spectrum. I was watching the last waltz because I’ll be filming. I was struck by the rawness of The Band’s Big Pink.