First, you know I don't think you are racist. I am not trolling on this issue either. It is too nuanced to have a real conversation about it on a message board. I suppose like anything else, it depends. In some regards race relations are better. In others, they are worse. We'll get those Zima's I promised and solve some issues.
To you direct questions, I cannot recall when I first heard the term 'white privilege' but I know it is something that has been out there for a long time. True story, I remember being in 8th grade playing some silly history contest game in our history class. If you got the answer correct, you could take a basketball shot to get extra points. The question had to do with Slavery and the kid who got it right said just before the shot, "I just think one day Black people will be rule and whites will be slaves so please remember me guys." Not sure why I remember it, but it was definitely a white privilege-type comment.
As for high school, we had an actual race riot. Blacks vs Rednecks. Couple of guys got hospitalized. Parents held their kids out of school for a few days after. Chris Rock talked extensively about race in his stand ups during the 90s. They were quite good. No race was safe from his takes, but I found they had a lot of merit.