That's the most racist and incorrect logic I've ever heard. When I shop for magazines, I pick up MD whether it has Branch Warren or David Henry on it. People buy magazines with subjects that relate to them, not who's on the cover.
I won't even address the fact that I've already classified you as an educated buyer (which puts you in a genre that transcends any labels) or that demographic research is used extensively when selecting marketing approaches.
I will address the fact that "THIS is the most racist and incorrect logic" you've "ever heard". You're 30 years old, you live in the US, and you've worked in the corrections system. And THIS - a de facto marketing practice - is the single most racist and incorrect logic you've ever witnessed?
Dude, stop being a drama queen and read a few books about market segmentation. If you don't believe that socioeconomic, race, and gender play a major part in addition to prospect interests, needs, and goals, then, well...