I was talking to someone the other day who was really bent out of shape over an extremely unpleasant customer. The kind of interaction that sticks with you for years.

I told my perspective on people. We tend to remember remarkable things - stuff that really stands out from the normal. The news media does the same thing. Normal, everyday stuff isn't "newsworthy."

So when an asshole customer stands out that much, it's because it's such a rare experience. People are mostly good, so the goodness doesn't stand out.