I've worked several retail jobs and some office customer service positions. My clients were all pretty wonderful but coworkers were a nightmare and not very good at providing customer service to be frank. It was often appalling to listen to them talk to and about our customers. It wasn't just a "having a bad day" thing either, it was constant....and they treated their coworkers crappy too. I had an occasional difficult client but it wasn't common and aside from one time where I needed my managers assistance to calm down a very unreasonable women who was basically trying to scam us, I could handle all problems quickly, efficiently and in a way which made us all happy and feel like winners.