I'd say it's more than jsut liberals. We have republican leaders who spend half their day whining about how offended they are.
IMO, it's the whole generation selfie... they're soft, they're self-important, they're entitled and they whine because people that want to bang them will "like" their whining status.
When I was 15, I knew I was insignificant enough that the world didn't give a shit about my "feelings" and that 1700 of my closest buddies didn't want to hear about my breakfast configuration.
Human beings successfully landed a spacecraft on a comet yesterday, and Kim K's greasy ass was the top story. WTF?