That's the kind of constant headwind that can add up over time and distort a society beyond recognition. Why? Because the disadvantaged group will see their disadvantage get worse over time, because in the vast average of thousands of interactions, they slide slightly backwards. As the disadvantage gets worse, the bias gets worse along with it. This can play out in many situations, from the ones that seem totally indefensible ("What do you mean we're being unfair, he's a murderer!"), to the ones that seem ridiculously minor.
https://en.wikipedia.org/wiki/COINTELPRO
> Beginning in 1969, leaders of the Black Panther Party were targeted by the COINTELPRO and "neutralized" by being assassinated, imprisoned, publicly humiliated or falsely charged with crimes. Some of the Black Panthers affected included Fred Hampton, Mark Clark, Zayd Shakur, Geronimo Pratt, Mumia Abu-Jamal,[18] and Marshall Conway. Common tactics used by COINTELPRO were perjury, witness harassment, witness intimidation, and withholding of evidence