Abscences from Advertisements

I had never really noticed the exclusion of some groups by advertisements. It is a rather odd that advertisement groups leave out Native Americans, poor people, and such. There is also a generalized template used by the mass media for describing a white male; semi-intelligent, skilled in blue-collar work, generally semi-overweight, and funny. What a great stereotype right? So we've replaced Native Americans and poor folk with the "modern-white-male" a vast generalization of millions of people who can say three phrases, "I need a beer", "Wanna make me a sandwhich", and "not my fault". Also, I believe that we don't include poor folks and Native Americans because in America we associate the two with more-or-less harmful connotations and therefore would not want to see them in advertising. Native Americans are alcoholics, poor people are blacks who sell drugs and "bust caps". Stereotyping is soooo fun...