I have seen this before and it is always interesting how quickly one group is so ready to be "better" than another not based on ability but simply for what makes them different even resorting to name calling "blue eyes" or "brown eyes".
I was interested in the parents reactions as well and was concerned about some of the violence the children described about a Dad or the enjoyment of hitting a sibling. A lot of racism is definitely learned and this left me to wonder what happened to the children? Was there a follow up study?
I feel like they understood what happened, but did it actually make an impact?