Handle an insult with acceptance. This may seem like a very weak response, but in many cases it is actually the strongest response of all. When someone insults us, we ought to consider three things: whether the insult is true, who it came from, and why. If the insult is true, the person it came from is reasonable, and his motive is worthy, then the insult is not an insult but a statement of fact and, moreover, one that is potentially very helpful to us. Thus it is usually the case that we do not or ought not take offense at our teacher, parent, or best friend.
In general, if I respect the person who insulted me, I ought to give thought to the insult and learn as much as I can from it. On the other hand, if I think that the person who insulted me is not worthy of my consideration, I have no reason to take offense at him, just as I have no reason to take offense at a naughty child or a barking dog.
Notice that, whatever the case, I have no reason to take offense.