Perhaps the greatest rudenesses of our time come not from the callousness of strangers, but from the solicitousness of intimates who believe that their frank criticisms are always welcome, and who feel free to "be themselves" with those they love, which turns out to mean being their worst selves, while saving their best behavior for strangers.
Judith Martin (1996). “Common courtesy: in which Miss Manners solves the problem that baffled Mr. Jefferson”
