I don't understand it, they choose to remember the bad and forget the good. I just don't understand it. Human behavior is an interesting thing to study. It seems that no matter how much good is happening in a person's life, the majority tend to remember the bad that has happened in their life. What one takes from yesterday, creates the emotional pictures they use to define today.
Negative people have a way of playing with our emotional presence.
I learned a long time ago all behavior has an agenda. People who are negative have developed that behavior to achieve their plan. For many it is a guaranteed way of getting attention. They found out at an early age if you are good, no one pays attention to you. BUT, if you are bad, you get all the attention in the world.