Looking Down on Him
The manager looked at him coldly and arrogantly told him that she did not have to explain herself to anyone and that he had to leave the establishment immediately. Karl was not used to this kind of treatment from anyone and certainly was not used to people looking down on him.
Missing His Uniform
Karl was acutely aware of the fact that the manager or restaurant workers had no idea who he was or how influential he could be. He realized that walking around without his uniform would show him how people truly respond to him. He felt mistreated and upset, so he decided to take note of the situation and do something about it.