It is frustrating how often jerks get rewarded.
The old line about the squeaky wheel getting the grease is true (although a reader once reminded me that squeaky wheels sometimes get replaced).
Those of us who are steeped in manners may well wonder if we would get better treatment if we were more difficult. We sense that in many cases, the person who is courteous is easily ignored while jerkish behavior is served and inadvertently rewarded.
The general rule, of course, should be that poor behavior will result in undesirable consequences, not better ones. When the other side is rude, the counter-offer should get worse, not better.
The appeasement of jerks is often justified as an expeditious way of getting the person to go away. I won't say that is always wrong but it is almost always wrong. When the jerk strolls off with a win, we've just reinforced a pattern of negative behavior that will be carried on to someone else.
There is a less extreme scenario where no jerk is present and yet the patience of the polite is taken for granted. That's where the level of service is lowered because it is quietly known that it can be done. The victim risks mistaking meekness for patience and cowardice for courtesy. It is not out of order to say, "I deserve better treatment than this."
And when a polite customer says that, organizations should listen.