People who treat other people as less than human must not be surprised when the bread they have cast on the waters comes floating back to them, poisoned.
James Baldwin (1924-1987) African-American writer.
A fly may sting a stately horse and make him wince; but one is but an insect, and the other is a horse still.
Samuel Johnson (1709-1784) British author.
The only cure for contempt is counter-contempt.
Henry Louis Mencken (1880-1956) American journalist, satirist and social critic.
It's not a slam at you when people are rude -- it's a slam at the people they've met before.