I still remember the best elementary school slumber party I ever attended. It occurred in Westchester, California, Westchester was close enough to the negative ions the Pacific Ocean produced to give the air a tinge of good health and make the noisy proximity to LAX seem worth it. I was in fifth grade. It was 1990. I was always weird and gregarious. The way the middle class likes conservative fashion while the very rich copy street wear and punk rock, the boringly accepted kids teased me, but the very popular, who had no insecure need to put others down, were often curious about me,and I had one-off playdates with the upper echelon, as well as getting invited to their slumber parties, at least until I got blackballed from their parties after this best one ever, thrown by a girl so pretty she could have been a sitcom star. I had a precocious but confused sense of class consciousness when I was in elementary school, because I lived with the upper middle class side of my...