We also marched for Civil Rights and had a Black Prom Queen - she was a friend of mine.
Unless you are our age, you lack perspective.
I graduated in ‘67. The student population was about 80% non-white. Needless to say, I had many close friends who weren’t white. Students of all races got along just fine. We would even make jokes that would be considered “racist” today. Teachers (mostly black) were highly professional, and taught their subjects seriously without social commentary. CRT wasn’t even “a thing” back then.