I can't really say from a day care employee point of view. My experiences employed by a daycare were limited to one center in a predominately low income area. I covered at a center in a higher income area, but was not there long enough to get a feel for the families.

As an aside, I moonlight as a face painter. From working birthday parties and community events, yes, horrible parents are pretty equally distributed.

TBH, I see more honest family interaction when I'm face painting than I did as a daycare employee.

Edit for clarification.