Edward Albee has often, if not always, written about educated people whose learning has devolved into cutting banter as the years have marched on. They've honed their intelligence in such a way that they can be sarcastic and cynical on an impressively erudite level. From time to time as they insult each other, they can also be resoundingly witty.
It's true of George and Martha in Who's Afraid of Virginia Woolf? (1962's non-Pulitzer Prize winner), and it's equally true of Tobias and Agnes in A Delicate Balance (1966's at-last-Pulitzer Prize winner).