Generally insults work only if we believe there is an element of truth in it. But consider this. If the intention is to build then there is no need to publicize the fact. A quiet word will achieve much more.
You may also notice that the criticisms are not considered or weighed. Usually they will pour an array of insults hoping one will hit the mark. This is key.
Actually the intention is to distract. To make you lose confidence in yourself, since most of the insults have no merit. You are in fact taking in poison. Now do you see why the insults need to be delivered with beligerence?
So Tuesday, you talked about the need for confidence. One way is not to accept the poison of unjust and unreasonable put downs. To do that you need to look closely at the motive of the person giving the insults. It's the other way around. It's the persons giving the insults who lack confidence.
Their intention is never to build but to tear down. Look closely, for if your confidence is restored, you will be able to see that they actually have no substance.