The famous example of this is the so-called "Regatta Question" in which an SAT question assumed a knowledge of Crew -- an elite sport that would have been a rather obscure reference for minorities from the inner-city. [1]
Like, from your post, I would say that Crew is an obscure reference for anyone living in the inner-city, not just minorities.
I'm a white male but I know that personally I had no clue what Crew was during my high school years. Anecdotally, I went to school in an area where the public school population majority was, well, what we consider the minority when discussing race relations.