There's an element of truth in that John937. We Americans are just as snobby and class conscious as anyone else. In America though, unlike everywhere else, the social register is mostly about how much money you have, regardless of education level or conformity to bourgeois standards.
People with more money than, for example, me, would need to talk to me for a while and ask me questions which I would have to answer before finding out that I am in fact a person of less than fabulous riches, and therefore an inferior being. Whereas if I had a ponytail and a wifebeater, and a pair of shorts I made by hacking my baggiest jeans off 6 inches above the ankle, they would dismiss me as white trash immediately. If they found out later I was heir to the Depends fortune, they would come back and kiss my ass, white trash or no. That's the kind of fake people we all are.
I therefore am only talking about the white trashiness that everyone knows as such when they see it.
I have had no success trying to establish a Universal Standard of White Trashiness. Most of you all have them confused with rednecks, which are mostly confined to Elvis land. Yeah I know New Hampshire is all rednecks, and up-state New York too. I see mostly white trash from the suburbs. Suburban white trash. Women who wear white stilletto heels with band-aids hanging off their heels along with shorts live in their hundreds and thousands there.
Anyway it's a good way to antagonize people. OK, if you're mother weighs over 400 lbs you are probably white trash.