While there are certainly some silver-spoon types in upper class looking down upon the hoi polloi walking back to their seats in Economy I believe it's more common to see the reverse-snob, the person who sneers at the upper class passengers as if to say, "What makes YOU think YOU'RE so much better than ME?"

On occasion when I get to respond (because the thought is said aloud) I answer, "I'm not better than you, I just chose to pay more money for my seat."