"Be grateful to everyone" is about making peace with the aspects of ourselves that we have rejected... If we were to make a list of people we don't like - people we find obnoxious, threatening, or worthy of contempt - we would discover much about those aspects of ourselves that we can't face... other people trigger the karma that we haven't worked out.
Pema ChodronThe second noble truth says that this resistance is the...mechanism of what we call ego, that resisting life causes suffering.
Pema Chodron