You have an interesting way to spin things. No one is railing against stupid people. It is a statement of fact that there are stupid people and that if you work retail you will have to deal with your share. Don't like it don't work retail. It is a statement of fact meant as a heads up, nothing more.
No humbleness or humility needed when stating a fact.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.