I think the current "You kids get of my lawn!" nonsense is especially shrill because of a combination of sublimated guilt and projection. The previous generations — especially those doing the most whining — had an extremely easy youth, with abundant opportunities, high paying jobs, and cheap housing. I was talking to a more introspective member of that generation recently and he told me that on his first salary, barely a year out of college, he split up with his wife. So he left her with the house he'd just bought for them, and he bought another.
But this is also the generation whose waste, narcissism, and in the end cowardice (look who put George W. Bush into office) has nearly destroyed our country, and left it a virtually hopeless place for youth.
Sitting in between the two, my lot's not so great, but the fact that young people today still have the positive, can-do attitude I always find them with (generally mixed with significantly more wisdom and perspective than the old dessicated turds whining about them in the editorial pages) always astonishes me.
There needs to be a hashtag for millennial bashing. Atrios does a pretty good job of calling it out when he sees it, but I don't see a good way of gathering the threads.