There are some people who always talks in a negative way and they talks negative about themselves and talks negative about others. They are never happy about things in life and always wanted better things in life.
I have seen people who even get unexpected money and other comforts would say they wish they would get better. They never get happiness on the things they get and they wanted more and more better things in life. When some one gives them a present or dress they would say that the dress or present is cheap and the person would brought them more expensive thing. Some people would say that they had given more expensive present the person during function and the person has brought them less expensive thing.
I do think that we need to be happy with what things we have and not to worry and not to disappointed on the smaller things we get from others in life.