How Not To Be Angry- Buddha and the Angry Man

I like this story about how Buddha interacted with an angry man and was not affected by his insulting words. From my workplace, I see a lot of angry outburst because people are easily affected by what others say and thus they kept thinking about the unhappy thoughts. I be affected for a while but will just let go since I don't accept what they said after learning from this story. 

In this story, as Buddha was walking in a village, a very angry man insulted the Buddha and said that he had no right to teach others. Buddha was calm and serene as usual and he asked the man,  “Tell me, if you buy a gift for someone, and that person does not take it, to whom does the gift belong?”

The young man was surprised to be asked such a strange question and answered, “It would belong to me, because I bought the gift.”

The Buddha smiled and said, “That is correct. And it is exactly the same with your anger. If you become angry with me and I do not get insulted, then the anger falls back on you. You are then the only one who becomes unhappy, not me. All you have done is hurt yourself.”