"All morons hate it when you call them a moron"

This quote by J.D. Salinger is a humorous method of mentioning the hypocrisy of people who use the word "idiot" as an insult. It suggests that those who utilize the word "idiot" to insult someone else are themselves idiots, considering that they would dislike being called a moron themselves. It also recommends that people who utilize the word "moron" as an insult are not just hypocritical, however also insensitive and unkind. The quote implies that it is incorrect to use the word "moron" as an insult, which it is better to be considerate and kind to others. It is a suggestion that we should believe before we speak, and that we should be mindful of how our words can affect others.