Why is today's generation hyper-sensitive and PC?

Everywhere you go, someone is saying how “offended” they are over something trivial and minor. As if being “offended” gives someone special rights or privileges. No one at all cares. Yet, so many people nowadays think that the world revolves around them and that everyone’s freedoms stop where their feelings begin.

Being thick-skinned, brutally honest, and someone who likes jokes, I absolutely hate how big of a crybaby so many people are, nowadays. I’ll never change to appease people who think the rest of the world is supposed to conform to them. Yet, we have sites like Tumblr and a whole generation of thin-skinned whiny crybabies.

Can someone please tell me why the movie “Demolition Man” has become a reality and our entire generation has become soft, whiny and childish?