The Me Me Me Generation: Why Do Adults keep Stereotyping Us?

     The other day I was on a job cleaning up stacks of old mail when I came across a Time magazine from May of 2013. On the front there sat a girl with straight red hair holding a camera at arms length away from her. The caption above her head read "The Me Me Me Generation: Millennials are lazy, entitled narcissists who still live with their parents, how they'll save us all." I was shocked by the title, and proceeded to read the article, hoping that "The Me Me Me Generation" was just a catch to get consumers to purchase magazines. I was, evidently, wrong. The article went on to describe how young adults born from the early 1980's to the early 2000s were spoiled, self-indulgent, didn't care about anyone, and had no work-ethic whatsoever. (I found this ironic, considering I was reading this article as I was hoisting piles upon piles of mail to be sorted, working so I could raise money myself for a trip to Europe.) According to the article, all that the "Y generation" is focused on is taking selfies, social media, and other things of that likeness.
I, for one, was outraged. The stereotypes surrounding Millennials may be true in some cases, but what about those instances where it isn't? Many of the young adults I know who indulge in social media from time to time are also Straight-A students and participate in a variety of sports and extra-curricular activities. I know kids who wake up at the crack of dawn and stay late doing babysitting just so they can earn money towards a substantial purchase that ISN'T a form of technology! Many of us have to come home after sports and extracurriculars to do another hour or more of homework. We have chores, grades, and many other factors that contend with our daily lives, yet somehow, we are still the ones who are called lazy.
What made me even more angry about the article was that it hasn't been the first time I've seen something like it. Many media outlets also contribute to the hatred of Millennials, fashioning the same stereotypes as the Time article.  We're made up to be a joke, a spectacle to be mocked by the press. How is this type of stereotyping different from any other, and what makes it so acceptable and widely used among the media?
Joel Stein, the man who wrote the article and has been writing for Time for years, is, in my opinion, in no place to be speaking about the antics of the Y generation. He has a child who isn't even middle-school aged, yet he somehow seems to know all about our antics. I also found this *ahem* selfie floating around the internet:

https://twitter.com/thejoelstein

oh, and this

https://www.facebook.com/thejoelstein

Hypocrisy at it's finest. 

As I left that house with money towards my trip nestled soundly in my back pocket, another thought crossed my mind: even if our elders like Mr. Stein tell us "who we are", or who the world has made us up to be, doesn't mean we have to listen. This is our future, and we're the ones who make it ours, not the people who write allegations about us in newspapers and books. It's our time, and it is what we, the Millennials, make it out to be, and I guarantee, by the time we're done, the world will still be here in one piece. 

Said Offensive Cover in Question (www.time.com)