That study is from France and doesn't mention the pervasive nature (in fact it shows some areas/groups don't have problems). Do you have one from the US? I'm particularly interested in one that has data to back up your "pervasive" claim.
American educational researchers are surprisingly uninterested in this topic; I managed to find recent studies on it out of France, Italy (from last week!)[0], the UK, Sweden, Denmark, and the Czech Republic, but none out of the US. In fact, I found more material in the US about the gendered bias in grading by students of teachers than by teachers of students(!!!).
I'll look more into this to see if I can dig out an American specific study.
