How would low teacher expectations and oppositional culture explain the abysmal performance of HBCUs? How would it explain crappy MCATs and LSATs? Are populations of students performing at the level that would let them apply to Law and Med school so malleable to these forces that they literally cannot learn material? How about if we look four years further on at the post-med school exams used for residency application? What about if we look yet further on to the success rates for passing specialy board exams in medicine? When does this effect end, and why is there such a pervasive pattern across the world, whether the population demographics put a SIRE group in the majority or minority?
How would either of these explain what every employer sees repeated as a nearly universal pattern: On employment exams, with a defined body of information to learn, the pattern of asian on top and black at the bottom is going to persist, even if you hire outside consultants to carefully craft the test in order to make sure it is race neutral? (See for example, the New Haven Ricci v DeStefano case, or any large-city police force trying to screen applicants)
Oppositional culture and teacher expectations don’t even begin to pass a sniff test. They are nearly all simple studies or collections of anecdotes filtered out for confirmational bias.