A racist society does not make us stupid. It is exactly other way around, ignorance makes people racist. Biases of all kinds come from the lack of knowledge.
I grew up in Poland where all people were of the same race. Hence, biases were addressed at different aspects of people look, behavior or origin. For example, I received many callous comments due to me wearing glasses. Gradually, I realized that those seeing others as inferior are ignorant. Some might have university degrees, but have narrow minds; besides, being experts in their domains. As humans, they were dunces.
A dunce is a better word than stupid, used by Ms. Fleming. Naming someone stupid implies condemnation, and indicates helplessness in our abilities to correct the problem. Calling someone a dunce indicates that if that person get exposure to knowledge, he or she might change. Hence, I find a bias in Ms. Fleming’s approach. After all, dunces are people too. The question in front of us is what we can do in order to raise the knowledge among us all, and by that lower the biases.