Well, me and the hubby definitely would not be considered yuppies. Blue collar jobs and living in a doublewide in Cosby is pretty non yuppie.
I have met the type that you are talking about though. The ones with the "attitude" But having more $$ to spend on gear don't make them better fishermen. That takes skill and the cost of that is practice and dedication.
I think people like that have that kind of snob attitude in whatever they do, be it fly fishing or anything else. They are missing the real beauty of the sport.