Given the story of his encounter with the psychologist (also in Surely You're Joking, Mr. Feynman!), I'd say he thought so, and ditto with the other fields he mentioned. I believe he was criticizing acceptable social conversation (at the Nobel Prize banquet, I believe!) as being restricted to topics on which nobody sufficiently facile with words could be conclusively shown to be wrong.
(Last month's started a little late, I thought I'd bring it back to its original schedule.)
A monthly thread for posting any interesting rationality-related quotes you've seen recently on the Internet, or had stored in your quotesfile for ages.