If we're going to go there: I went from being a straight-A math student in Pre-Calculus to a C (verging on D) student in my AP Calculus course in high school. In college, I retook Calculus and aced it, receiving one of the highest final scores in the class. The first course was taught by a black woman. The second was taught by a white man. The last was taught by a black man. I am a black man.
People in this conversation are frequently quick to dismiss the value of anti-racist (and, for that matter, anti-sexist) policy and execution in STEM pedagogy. They lean on and extrapolate erroneously from the notion of many great mathematical thinkers' probable hereditary advantages to a general, in-born hierarchy of fitness for STEM thinking. Coincidentally, this shields them from tough conversations regarding their own fitness to teach, and especially to teach children whose backgrounds they cannot or will not find sympathy and empathy for. I will admit that the solution is not so simple as my anecdote might suggest, but the implied path shares character with the correct one, in recognizing the farcical nature of assuming that the status quo - especially in this country - is a product of actual potential playing out as it must necessarily so, and not of history overshadowing even the best of intentions (though they are usually less than that).