Everyone should work some form of retail job at least once in their life.

I was a motorcycle mechanic for six years before going to college. Some customers where a joy, you looked forward to seeing them, most were just average Joes that needed work done, and a very small few were arrogant self entitled jerks, but it was a job, and you had to deal with it.

Some of the nicest people I know have had retail experience in their life.