Almighty?!?

In the 27 years of my life I have met all kinds of different people; different countries, different cultures, rich, poor, preppy, hippie, laid back, control freaks, etc. And I love the diversity, it is amazing how much you can learn about yourself when exposed to extremes. When you think you have gotten yourself figured it out, there it comes a different situation, a crisis or even a cause for celebration and you learn something new. What really bothers me is how people think they can just know so much about other people's lives. And not only talk about it but also judge it. Don't we all have enough demons to deal with of our own? Why is it that we must waste so much time and energy on somebody else's life and not in a helpful, constructive way?
As I'm typing, I get the picture of the little angel and the little devil in each side of my head arguing back and forth like in the cartoons. And as one side says "It's ok, people sometimes don't want to face their own demons, so they have to talk about somebody else's problems." The other side replies " Are kidding me? People should just get a grip and go about their own problems." It leaves me wondering... When is enough, enough? When should we stop accepting such behavior? How much understanding can one person be, without being insensitive? Why must people be so negative? Maybe I'm crazy and I just worry way too much, but sometimes i just feel like saying " I don't care! If it's not something good, constructive or even something your dealing with in your personal life, keep it to yourself".
I wish I could only have some answers to all the questions in my head...