The fallacy that's illustrated by the statement "The customers should be more polite." is the tu quoque fallacy.
The tu quoque fallacy occurs when an invalid attempt is made by a person while responding to criticism. From the question, we can infer that the person accused the customer while responding to the customer's rude behaviour. This is an example of the tu quoque fallacy. It is when a person discredits the argument of others
Ban, means to get rid of something completely, boycotting is basically a form of protest, were you stop buying something to show defiance to your country such as tea/stamps in the American revolution
