Market Segmentation or Stereotype?

http://www.claritas.com/MyBestSegments/Default.jsp
http://www.esri.com/data/esri_data/tapestry.html#

In my Consumer Behavior course, my professor gave us the assignment to go to the above websites, enter our zip codes and make a summary of the information provided about the major market segments in that area.

I entered, obviously, the zip code from the town where I live in, and have lived in consistently for the past 15 years, in Texas.  What I found was in some ways disturbing.  There were comments on nearly every segment provided that the "people" that live there were, for lack of better terminology, technological retards.  I realize that my zip code also covers about half of the county in which my town is located, but there was NOTHING that was included in ANY of the 10+ segments I read that was about the college students who live in the area, or anything that I could personally identify with.

Is it possible that these segments are nothing but a generalized stereotype that was made up based on the population density of the area?  I know that there are definitely areas that are still untouched by technology still today, but there has to be at least 75% saturation of at least 1x coverage for cell phone service, if not more, when I was working for the US Census Bureau 3 years ago, I was consistently getting 3G coverage in the rural areas I visited.  So, how is it possible that the top two market segments listed on any of the settings contain information about how the population has NO cell phone usage?

I do, however, agree that the average income of the families living within my zip code is significantly lower than some of the surrounding areas, but I also know that in 2008 our local economy of mostly oil based industry, and retailing was hit extremely hard by the recession. Of course now the market is depressed compared to the "richness" it was used to before.

I don't know... if these market segments are the main way a new business decides to come to an area, maybe it's not good that our zip code is listed in such a... "back woods" kind of way that leaves out those of us who are environmentally aware, own 2+ computers, have college education, use cell phones, DO NOT drive huge gas-hog vehicles.