Maybe I'm too cynical, but my take on it is that most people are already at the vanity/self-absorption phase, the appreciation is lacking, and what's desired most is to be perceived as someone who really appreciates food/beauty/life in general. Or alternatively that they are in some way vaguely unhappy, had expectations of life fed to them by society but they don't quite fit and aren't self-aware or introspective enough to realize it and choose for themselves. And their response is to project back into society the appearance that things fit, both to convince others and to convince themselves. It's especially sad considering that if you found a better fit, modern society is mostly large enough to have a place for it.