It's natural for you to feel sad when some people are rude to you. However, what I'd like to say is: try to understand others, and let the sad moments go.
Last Sunday, when I was shopping, I met an old friend of mine(收银员) at a nearby store. What made her sad was that sometimes the customers were rude to her at the store. She said that it even made her a little bit nervous when she worked.
"Well, I think I can understand, " I said. "You know, and I had sad moments as well. Sometimes patients and their family members could be very rude, but I tried to understand them. I let the sad moments go and just try to do my job well. "
She looked a little relaxed after hearing my words. "How kind and friendly a girl you are!" she said. We talked for another while and then she went to work with a big smile on her face.
In fact, as long as we try to understand others, our life will be better and better.