The high school I went to in the California central valley had a separate section of the campus for Latino students, who were the children of migrant farm laborers. Once, while I was editor of the school newspaper, I suggested we do an article about it. The other students who worked on the newspaper (many of whom came from families that owned farms in the area) immediately rejected the idea; the faculty advisor gave me a patronizing smile, and told me it would be a bad idea, because it would cause trouble.
My high school was unusual as modern California high schools go, in that there actually were people from different ethnic groups and social classes in the same high school -- which meant that segregation was readily visible. Most of my classes were "college prep", and were therefore almost entirely white and middle class, with a few exceptions. It was only in the handful of non-college prep classes that I had to take, that I encountered students from other backgrounds.