In this interesting article, Dzogchen Ponlop Rinpoche talks about how to deal with difficult people. He mentions:

We have so many concepts about others, and sometimes even before we know that person, we’ve already given them this label: “Difficult.” It’s like a big tag they’re wearing whenever we see them. So I think what’s obstructing us from dealing with them is our prejudgments and preconceptions about who they are. We have so many thoughts about them even before we get to know them. In a sense, this may make you less able to deal with a “difficult” person. And actually, if you take a closer look, it may turn out that the difficult person is you.

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