There are a few things we need to change . Remind yourself that their behaviour is probably a result of their own past problems and their difficulty adjusting to life. Using your sense of humour, accept them the way they are, rather than wasting time trying to make them reasonable. Arguing with a difficult person is like arguing with an unconscious person - useless. Once again, use relaxation and rational thinking to stay in charge as you adjust your responses to them.
Difficult people are often critical.
To reduce stress, see all criticism as directed at your actions, not at you. See criticism as a brick thrown at you - with a message attached. Read the message. Thanks for your useful comments - that will really help me. Think of problem people as chances to learn.