Your son must have had some home schooling. :)
Believe it or not, public school. In California! AND...the Bay Area. We’re in a small town and there is a lot of involvement with the elementary and middle schools.
Of course, when my oldest daughter was a Junior in HS, I went to “Back to School Night” and got ultra PO’d when I saw a picture of Che on her English classroom wall. It’s no wonder the HS doesn’t encourage parental involvement the way the elementary and middle schools do.