How about this answer:
Because millennials are self-entitled, self-absorbed, whining, largely pathetic excuses for humans entrusted with the propagation of our species. (I speak as a member toward the beginning of the “millennial” demarcation…early 80’s.)
I might want to nuance that answer a bit, but there’s more truth than hyperbole.
By contrast, you can read Rachel Held Evans’ response. You will never hear me say, “I tend to identify most strongly with the attitudes and the ethos of the millennial generation.” Of course you do — your blog has demonstrated that, time and again.
I was actually more annoyed by her apparent attraction to “high church” forms of the faith (Catholic, Orthodoxy, etc.) — because it appears more “authentic” — which is just another way of expressing the millennial obsession with the self’s “authenticity.” On that point, David Koyzis, at the First Things blog, hits the nail on the head.