Remember, that not he who gives ill language or a blow insults, but the principle which represents these things as insulting. When, therefore, anyone provokes you, be assured that it is your own opinion which provokes you. Try, therefore, in the first place, not to be hurried away with the appearance. For if you once gain time and respite, you will more easily command yourself. – Epictetus
Why is it that they say “fools rush in where angels fear to tread?” Quite simply: the more your function is aligned with truth, the less risk you have of being “hurried away with the appearance.”
Take time to consider this principle: the truth needs no defense. Once this principle is clearly understood, there is no longer need for either defensiveness or taking offense. That another is speaking or acting on the basis of misguided human opinion instead of truth is no cause for losing your composure. In fact, when such is the case it behooves you to remain calm and resist the temptation to judge by the appearance, all the while looking for a way to shine the light of truth compassionately upon the situation and those involved.