The loudest people have always been heard the most, and the internet age makes them even louder.
Don't forget the struggle and the fight -warzone
The ones I deal with don't seem to have much in life experiences/hobbies for whatever reason. I don't know their backgrounds that well. Having said that, I have found if you find something that interest them and mentor them on that they really seem to respond to it. A few of them have really turned it around it and didn't take too much to get them in the right direction. Something as little as taking them fishing or a sporting event has made a pretty positive impact on their lives.
A few years ago I went to conference where the speaker asked some questions of the audience. similar to what are being stated here along the lines of work ethic, being self centered, being entitled...
Was it her fathers generation (who was on the stage)and a baby boomer, her generation- gen x or millennials. We all answered and then she spoke on each and the answer was all preceding generations had similar negative views of the next generations. Her research did show baby boomers, with their protests, long hair, and life styles received some of the harshest criticism from their parents generation.
In a very small sampling of having coached in the last few years at a d-3 basketball program and have worked in a mission driven field for 30 plus years. I have been very impressed by millennials I have come in contact with. They have been hard working, willing to do the extra work to excel and had a real understanding of the bigger picture and how they fit it. I do have to explain more, but that is not a challenge to authority, but how does this all work together. Their commitment was to the teams and the work we are doing.
On final note is that many of these kids have seen their parents, relative or neighbors jobs sent over seas or replaced by automation. I would think if I was their age, I might would think about the future of the company or the job I was doing as well.