David Letterman, as my mother used to say, is “common.” That is, he is no gentleman, he is unacceptable to polite society, he ranks in the social pecking order with cigarette butts laying on the side of the street. He is crass, vulgar and ugly. Considering all of his traits, he fits in well with CBS and the national media. Message to his sponsors: I dont watch his show so you will never get me as a customer by advertising with him.
And no one can certainly blame you either.