Each of us engages in activities, throughout a given day, of which many of those activities, directly or indirectly, have some sort of effect upon other people. Those that are enlightened, strongly desire to know the effect that they have upon others, so as to better understand the consequences of such; for good or for bad, and subsequently with that newfound knowledge, can consciously amend their actions so as to better accommodate their effect upon others. That is to say, if one has a habit of being dismissive to others, it is possible to correct such an action, by simply being less dismissive, and therefore more open to the value of others, and to thereby accommodate those others more readily.
This signifies, that those that really do pay conscious attention to what they say and do, and how this impacts other people, thereby make a more concerted effort to conduct themselves in a manner which is of a more accommodating nature and thereby a more positive influence upon others, which subsequently improves their own character, day by day. On the other hand, those deliberately not paying much attention to the effect of their actions, and therefore are essentially ignorant or unconcern about the consequences of their actions, have taken upon themselves the mantle that other people and how they are affected, is something that is of no or little concern to them.
The problem with being purposefully ignorant about caring about how one affects other people is that this is clearly selfish, and a society consisting of nothing but selfish people is always going to be a society that is going to be untenable. Rather, it is in human nature, for people to be both sociable as well as to congregate into voluntary societies, for the betterment of those people, in whole. This means that those that are entirely selfish, and do not pay attention to their actions and thereby the consequences of their actions, are in implicit violation of their duty that they owe to that society of which they are a member of.
So then, in order to properly learn to become good members of society, as well as to become mature individuals, it is imperative that we learn how to interact with other people in a manner in which we see other people as having the same basic worth that we have. So that, as much as we might not appreciate meaningful constructive criticism or the pointing out of errors that we have made with other people, purposeful or not, these are the very things that we need to be aware of, because ignorance of such, is surely not bliss.
Those that closed their ears to that which they should and ought to be heard, are doing nobody a favor, for to deliberately be ignorant of that which we should be knowledgeable of, is a severe character flaw, that needs to be correctly, forthrightly. Each of us is gifted with the art of communication, in which one of the purposes of that communication is to pass on relevant information, for the benefit of ourselves as well as to others. Those then, that will not listen to that which is for their own good as well as for the benefit of society, at large, have discarded and disregarded that which needs to be properly addressed.