Drs. vs Truck Drivers

So, I worked two parties the other day. One for truck drivers and their wives and one for a dermatologist's office. The truck drivers were very polite, tipped well, ate well and joked a lot (not always politically correct). They left on time because they knew that we had another party after theirs. The dermatologist's office started out politely, drank all kinds of specialty drinks, ate less, made a huge mess opening their gifts and didn't want to leave when the party was over.