The "miscreant" is probably some muppet who's nigh on minimum wages by the sounds of it and who may possibly be lacking motivation, let alone the social skills to communicate on an acceptable level.
There are different ways of "disciplining" people, it used to be called man management in the pre PC days, and is one of the most difficult skills to master. Some people "have it", others never will as long as they have a hole in a certain part of their anatomy as my dear old dad used to tell me, although he didn't use the word "anatomy", despite the word beginning with the same letter!