That’s that woman who tricked the audience into thinking that brown eyed people and blue eyed people had innate differences right? I remember watching her on the Oprah Show, it was particularly entertaining.
The thing that strikes me the most would have to be that other characteristics couldn’t interfere with eye color. Skin and hair color are more striking to a person at a glance, than eye color. So those traits would either have to be ignored, admittedly may be hard to do, or not be a factor. Thus, this also has to be in an area where blue eyed make up a quantifiable amount of the population without any other characteristic interfering. Thus I look towards Northern Europe, where blue eyes are very common, maybe some invading force, establishes a rule over a native brown eyed population? It’s just that blue eyes is often found with blond hair, so that would have to be accounted for as well. The best I could come up with are blond haired blue eyed Scandinavians, maybe Vikings, occupy an area perhaps in Poland, where the population are relatively brown-eyed. This I gathered from some basic percentages on distributions of blond hairs and blue eyes. Anyways, perhaps, to differentiate from the elite of the society, blue eyes is labeled as superior, and this evolves over the years into regardless of foreign or native ancestry, blue eyes is considered the social differentiation, over other factors.