I hear, on a daily basis, probably hourly basis, people – complaining about people.
Some of it just first-world-problemesc.

First thing to do – be open to the possibility that you’re a bellend and just as bad.
Elbert, in the picture above had it right. He actually meant ‘bellend’ when he said ‘fool’ in the quote.
I’m open as possible to the possibility that I’ve been a bellend or a bit of a twit.  In fact, I’m probably being one right now.
Some of the worst people I know, spend most of their time complaining about other people. A trip to Peru and some Ayahuasca would help in this scenario.
Is it a case that everyone else is a bit of a nob and that you are morally superior?  Have a think about it

Second thing – Accept that every demographic, every society, is full of ‘bad’ people.  It can’t be  helped.
If the ‘bad’ people aren’t running around with weapons slaughtering everyone (like in somewhere like Sudan (recently watched ‘Machine Gun Preacher’)); then you are pretty lucky and don’t have, in a relative sense. Much to moan about.
This is related to the 99 problems part of this blog post. Everyone has 1 big problem – I once overheard someone complaining about the road tax on her Bentley and Range Rover.  You lose perspective easily, it’s just human nature and will depend on your environment and the people you associate with.   You probably don’t have much to moan about; have a think about it, are these people that bad on a global scale of things?
Be thankful for the people you don’t have to deal with on a daily basis, and all the other ‘good stuff’:

Last thing – ignore the media
Lots of newspapers etc. are sold on the basis of making people angry. Usually white middle class people.  Read a left wing media source, as well as a right(ish) wing one, to get a balance.  Nightcrawler is a great film to watch too; makes you think about the media we consume.