Cleese did say that he was doing research into a documentary and I thought he did okay regarding the question he was asked.

No doubt he wanted to plug his latest shows and had grown tired of further talk on the cancel culture and her bringing up the Dave Chappelle situ may have been a curve ball which he wasn't expecting.
Sharpness and slight of tongue will have waned a little but his exit I thought he handled rather well, not unlike one of his sketches.

"Older" comedians have been mentioned and being in that category, JC may have become a little cynical, understandably in his old age.

Though he did do well not mention the war!