How to treat friends who always complain around you?

Many people like to complain and have no positive energy. If you spend a long time with such people, they will feel very tired. They always like to complain about social injustice and bumpy fate, but they never reflect on themselves. I don't understand why so many people are so gloomy. In fact, as long as you are kind and grateful, there is not so much injustice in this world. This is a happy and beautiful day. Why be upset and unhappy every day. I am a person full of positive energy, and I am silly and happy every day. Therefore, I don't like to have too much contact with people who are always complaining and full of negative energy, because they will consume a lot of our happiness! I hope everyone, every day is beautiful!