“The most bitter insult one can offer to a Londoner is "bastard" — which, taken for what it means, is hardly an insult at all.”

Promoting "Crocker's Rules" at SL4 (c. 2000) http://www.sl4.org/crocker.html
Context: Declaring yourself to be operating by "Crocker's Rules" means that other people are allowed to optimize their messages for information, not for being nice to you. Crocker's Rules means that you have accepted full responsibility for the operation of your own mind — if you're offended, it's your fault. Anyone is allowed to call you a moron and claim to be doing you a favor. (Which, in point of fact, they would be. One of the big problems with this culture is that everyone's afraid to tell you you're wrong, or they think they have to dance around it.) Two people using Crocker's Rules should be able to communicate all relevant information in the minimum amount of time, without paraphrasing or social formatting. Obviously, don't declare yourself to be operating by Crocker's Rules unless you have that kind of mental discipline.
Note that Crocker's Rules does not mean you can insult people; it means that other people don't have to worry about whether they are insulting you. Crocker's Rules are a discipline, not a privilege. Furthermore, taking advantage of Crocker's Rules does not imply reciprocity. How could it? Crocker's Rules are something you do for yourself, to maximize information received — not something you grit your teeth over and do as a favor.

‘Not Welcome’: London’s Muslim Mayor Repeats Calls to Cancel Trump Visit http://www.breitbart.com/london/2017/12/26/not-welcome-londons-muslim-mayor-repeats-calls-cancel-trump-visit/ (December 26, 2017)

Source: It's Kind of a Funny Story

An account of the European Settlements in America (1757), pp. 19-20, in The Works of Edmund Burke in Nine Volumes, Vol. IX. Boston: Little, Brown (1839)
1750s

27
Les Caractères (1688), De la société et de la conversation
Context: To speak and to offend is with some people but one and the same thing; they are biting and bitter; their words are steeped in gall and wormwood; sneers as well as insolent and insulting words flow from their lips. It had been well for them had they been born mute or stupid; the little vivacity and intelligence they have prejudices them more than dullness does others; they are not always satisfied with giving sharp answers, they often attack arrogantly those who are present, and damage the reputation of those who are absent; they butt all round like rams — for rams, of course, must use their horns. We therefore do not expect, by our sketch of them, to change such coarse, restless, and stubborn individuals. The best thing a man can do is to take to his heels as soon as he perceives them, without even turning round to look behind him.

Meeting in the Vistalegre Palace, Madrid, 23rd April 2007.
As President, 2007
Source: Nota de prensa Zapatero: "Responderemos a cada insulto con una propuesta, a cada descalificación con una idea" en la web oficial del PSOE http://www.psoe.es/ambito/alcaladehenares/news/index.do?action=View&id=133350, Ya: Zapatero al PSOE: "A cada insulto, una propuesta, a cada descalificación, una idea y a cada exageración una sonrisa" http://noticias.ya.com/espana/22/04/2007/zapatero-psoe-mitin.html

Letter to Charles Henri Ford (25 January 1948), as published in In Touch : The Letters of Paul Bowles (1995) edited by Jeffrey Miller, p. 192

64
Golden Sayings of Epictetus

Skipworth's Case (1873), L. R. 9 Q. B. Ca. 232.