I assume you are referring to this:
I can’t imagine that anyone who is intellectually honest would not recognize that as things stand today in our society a white person who does well in school is likely to be more successful in societal terms than a person of color who is doing very badly in school unless that person has some other strong talent. (Of course there are exceptions. There are always exceptions.) In addition to the problems faced by ANY kid who is a poor student, white or black, white privilege is all too real. As for her presence in this particular class, the OP indicated that this was generally regarded as a low level class that was full of kids who needed to scrape a passing grade in a science. A student who otherwise is in honors and AP classes is apparently a rarity. The rest of the kids probably have no idea why she is there. It sounds like he may resent her presence. In high schools kids know who is generally in which kind of class, and expect them to stay there. HS kids are far too likely to consign each other to groups than other people, in my experience.
Do I approve of any of this, or condone it? Of course not.