'Generation' overgeneralizing is a cousin to decade overgeneralizing, a handy way to generate trend stories and social pseudo-science out of vague impressions. (The categories and qualities remain fluid enough that, like Astrology, anyone who wants to believe can find some support.)

I find it interesting that the 00's have been less subject to such generalization and nostalgia, and I think it's for no other reason than it's harder to say, with no one clear winning decade moniker, compared to the Nineties, Eighties, Seventies, Sixties, etc.

(The Teens may be a little easier to refer to in casual overgeneralizations, and then the Twenties will come a roarin' back with decade-o-centric thinking.)