My complaint is not so much that things change, but that many of those changes seem to be "dumbing down" each successive generation. Social media being a perfect example.
That's been going on for many, many generations though.
Go read letters from the front in the American Civil War and compare them to letters from the front in Vietnam even. It's not a dumbing down so much as a massive globalization in which there is far, far more data to process. That means things that CAN be handled by technology often HAVE to be handled by technology - or other critical information gets lost. It also doesn't help that the (general, historical, quote-unquote) oligarchy has become far more efficient in its application of bread and circuses.
So while some of these kids cannot do long division (or spell, which is also a pet peeve of mine - though I've found it to be cross generational...overuse of asides is obviously not a pet peeve), they often have a much greater understanding of things going on across the world than kids did in the 60's and 70's - because they have access to that information.
Yes, there are vapid, stupid, hateful, utterly abhorrent Millennials - just like Gen X'ers, Boomers (forgive my American generational terms), and Silent generation members). It wasn't the youth that elected Donald Trump, outside of the fact that they're too big of a-holes to even vote - once again like every previous generation. And give them time. Like half of us are still under 20. I'm on the upper end (in my early 30's) myself, and suspect that most of my peers will swing around into normalcy a bit later than previous generations just because they spent their 20's under crushing debt.