I used to work in Glendora and my husband was born and raised there, and it is not "working class." In fact, google tells me that the median household income in Glendora is $86.442 while in Orange County it is $86,217. Of course, she was at GHS in the late 80's...about 5 years ahead of my husband. Even then, Glendora was a wealthy suburb of LA, though perhaps not wealthier by average than OC at that time.