Actually I think you made the point more clearly then the original poster who included purchasing large vehicles and fancy electronic stuff as 'classless'. Personally I can deal with people buying SUVs to drive a mile on a summer day if, as you point out, people learn to have a bit more class in their speech, mannerisms, and respect.

changing your baby's diaper on a store's checkout counter when there's a perfectly usable bathroom

Why was that even allowed?? That would of been an automatic "no way" in my book, with like you said, the perfectly good bathroom (yeah, those Koala kare things are everywhere)