There will always be one in every place you work that will drive you up the wall.
I have worked at 4 pharmacies over my rather short career and there is always that one employee that will do everything they can to make your life miserable. You either find a way to get used to it or move on to somewere else only to find the same thing with a different person.
That is the main reason why I got out of management. There is that one person, of course, as always, but now I can just ignore them and worry about my work and not have to worry about everyone bitching about them and rarely being able to do anything about it.
I miss the good ole days where you could just fire someone for being an incompetent, lazy, oaf.