People Like What You Like
Do you like to receive a present? Others like too. Do you like to be treated politely? Others like too. That is what we should treat to others. We should give him good smile.
Feeling happy to what other have will also make them do the same to us. There are many people complain about things in customer service desks. Sometimes, they use dirty words in complaining. Do that bad treatment to others make you happy? You will feel satisfied at that time but you do not feel the true happiness. Complaining is ok with a polite word. In my first post how to deal with unfairness, complaining is a kind of defensive action because you may suffer from lost. However, keep your peaceful state though you are in anger. Mocking and speak up loudly will not make you feel peace. You may get what you want at the time but some people feel hurt.
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Without yelling and mocking, you deserves what you have to own. So no need to shout to get what you want because when you do not like to be treated rudely, be nice to others. You like others' kindness so others do.