Mostly what I learned in high school was how to talk to kids from blue-collar families. Don't use multi-syllabic words, and talk only in concrete terms. Avoid use of abstraction and don't pontificate about anything.
Funny enough, I just finished reading the article and comments from the story on what it's like to be poor at an Ivy League (https://news.ycombinator.com/item?id=13480802). Personally, I thought that I never really felt disparate enough where I actually stuck out to my peers, and that the thoughts everyone had were more akin to class anxiety. It seems that the thoughts are not always unfounded I guess. Oh well.
I tried to empathize, but since I didn't value going along to get along, I didn't play along, and I didn't earn a lot of loyal friends that way.
It's not about class so much as values, and it wasn't my parent's values so much as it was my identity and valuing intelligence (although no adults I ever met devalued intelligence).