Why are African Americans always eating Chicken based foods in resturant commercials?

This is a serious question! For some reason they always put a black person eating chicken nuggets or fried chicken on Tv commercials? why must they be so stereotypical? Even in kid commercials for Mcdonald's you always see the little white kid eating a burger, but the black kid is crazy for the Chicken nuggets kids meal! Is this all one big coincidence? I doubt it! Does anyone else notice this too?