In all things Stoics sought to keep a sense of perspective by constantly reminding themselves that humans are part of Nature and individual humans are subject to the same determinants as the rest of nature. But we are free to control our judgement and it is our judgement of an insult that causes the hurt. "Remember,” Epictetus wrote, “that what is insulting is not the person who abuses you or hits you, but the judgment about them that they are insulting."
Thus the Roman Emperor Marcus Aurelius found it useful to remind himself to "Say to yourself in the early morning: I shall meet today inquisitive, ungrateful, violent, treacherous, envious, uncharitable men. All these things have come upon them through ignorance of real good and ill". People do not choose to behave they way they do so "[t]hat men of a certain type should behave as they do is inevitable. To wish it otherwise were to wish the fig-tree would not yield its juice."
The first strategy Marcus adapted was to simply accept that such people existed. The second was that we reflect on our own faults and remember that we inevitably irritate and anger other people simply by being who we are. This self reflection will help us become more tolerant of faults in other people:
When you are offended at any man’s fault, turn to yourself and study your own failings. Then you will forget your anger. - Epictetus
If we do desire revenge Marcus wrote, the best revenge is "to be unlike him who performed the injury".
But in most cases the source of the insult will come from a childish uninformed adult and we would be foolish in the same way that a mother would be foolish to let the “insults” of her toddler upset her, we would be foolish to let the insults of these childish adults upset us.
Epictetus too recommended we pause to consider our insulter. If he is a fool then rather than become angry or hurt, we should feel relief over his disapproval and insults. Indeed, we should be more concerned if we find the fool agreeing with us.
Humor is another useful tool for removing the sting from any insult. Seneca approvingly told a story of how someone once hit Socrates without any warning. Rather than getting angry, Socrates made a joke about what a nuisance it is, when we go out, that we can never be sure whether or not to wear a helmet.
Most of us however lack the wit for a humorous riposte. In that case Musonius said, we should “calmly and quietly bear what has happened.” This is, he reminds us, "appropriate behavior for a person who wants to be magnanimous.” But some attackers can mistake a disdainful silence as weakness and press their attacks. In this case the outward appearance of anger and 'cutting someone down to size' is justified. But we must remember Seneca cautioned, the purpose is to correct behavior in the future, not because we are angry over the past. The appearance of anger is fine, providing we do not actually suffer the passion of anger.
Finally, psycho-babble teaches we live as if we have complete knowledge of what we have not done: We think we know the outcomes of actions we did not take. When an insult hurts us, we tend to replay the scene and fabricate snappy retorts long after the event itself. Instead, just let it go says Marcus :
Is your cucumber bitter? Throw it away. Are there briars in your path? Turn aside. That is enough. Do not go on to say, ‘Why were things of this sort ever brought into the world?’