That is not always the case. I worked in a hobby/craft shop back in the 80's. One day I received a phone call from a irate customer about our night shift employee, I asked her to come in and discuss it. she told me how he had a couple of his friends there, and they, and himself were very rude, and obnoxious when she asked for help. I told her that the problem would be addressed, and hoped she would return again. She was a good customer, and always placed a big order. I talked to the manager, who was also the owner. Next day, at the end of my shift, when the other guy come on duty, the boss showed up. 15 minutes later, the employee in question was history.
Later on I found out he went to work for the other hobby shop in town, and I warned the owner about him. He lasted about 2 months there before they got fed up with his antic's also.
So sometimes it will happen.