Cold Jew
Not necessarily a Jewish person, although they seem to be the best examples. When a business person is giving you a PR facade and your comments strike a nerve having to do with his money or personal life. He (or she) then switches to a cold administrator quoting chapter and verse of regulations.
Trump was getting real chummy talking golf, till I mentioned his tax returns, boy, did I get the Cold Jew then! I swear I heard a voice behind me chanting: 'Thou art only a Goy'