When I lived in Boston, I worked for a company that attracted a lot of rich folk. I heard some true Boston Brahmin accents there. From a Cabot, for example.
I call people with the Gore Vidal/Buckley/Mr. Howell accent either jujubes or Sorrentos. The first comes from a couple visiting that Boston company I worked for: speaking to his lady friend, the man said, between clenched teeth, "Look, Jujube, they have [whatever it was]!" The name Sorrento comes from all the hoity-toities who summer in Sorrento, Maine.
I can't stand 'em (said in Jean Hagen fashion).