Re "never trust a Campbell."   The longstanding anti-Campbell feeling is conveyed in a funny story about a Scot talking to another Scot (a Campbell) and spitting every time he says his name. When asked why, he explains that it's nothing personal, nothing to do with his friendship for this particular man, but "you spit whenever you say the name Campbell."
It's a nice distinction. Between the name, with its infamous historical baggage, and the man. I make a similar distinction between man and office, and it cuts both ways.   I may revile Mr. Bush, for instance, but I respect the office of president, and in the unlikely event of being invited to the White House would refrain from spitting.