Why do some people inspire and others devalue?

Why do some people inspire, while others devalue? Probably, everyone has noticed at least once the difference between people, after communicating with whom you want to act, develop and believe in your own strengths, and those, after talking with whom you have doubts, guilt or a desire to justify yourself. The difference does not always lie in words. Often - in the attitude that a person demonstrates towards your feelings, successes and ...