I'd echo a lot of what's been said already. It is not necessary or desirable to be shielded from legitimate complaints. We need those, or we cannot know what or how to improve. It is not necessary to eliminate all conflict from family life, either, but only to manage conflict in a way that will lead to peace and growth instead of strife and injury.
As St. Paul advised: Fathers, do not provoke your children, so they may not become discouraged. Col. 3:21 It is important for people, from kids through into adulthood, to hear about five times as much positive as negative feedback. That may seem like a lot, but knowing that you are seen as a worthwhile person feeds a healthy desire to please and to live in harmony. Mutual correction is far easier inside a mutual admiration society.
It is important that feedback, good and bad, be about actions and not one's worth as a person. We can't change how loved we are by God by how much we do or don't accomplish. Rather, we accomplish because it is good for us to reflect in our lives the value we have in God's eyes, the dignity he gave us, the share in his life that we've been given. All of his commands are things we need to do for our own good, not simply things other people need us to do. We have to keep our eye on the fact that God has great plans for each one of us, that God thirsts for our perfection, no matter what our past failures.
Having said that, an adult can choose to do the work to unlearn unprofitable or false messages that his or her parents or teachers taught him or her, or rather can make an effort to cooperate as God does that work in him or her. The vast majority of us, if not all of us, have some imperfections in our thinking, in our view of ourselves and of the world. Those of us who have more to work on have a greater chance to give God glory by the change he can work in us: "He has thrown down the rulers from their thrones but lifted up the lowly. The hungry he has filled with good things; the rich he has sent away empty." Luke 1:52-53
When we realize how much we need God to turn us around, but have faith that God can do it, then we are thinking right down God's alley. We ought not spend a lot of time thinking about the injuries done to us in our lifetimes, but rather think on the goodness of God and how God intends to cleanse us of every blemish and heal us of every wound. Our Lord did not come for those who were self-satisfied, but to set captives free, to heal the broken-hearted. If we are among the broken-hearted, then we are very ready for God to work in us, if we but dare to look for his healing!
"Rejoice in the Lord always. I shall say it again: rejoice! Your kindness should be known to all. **The Lord is near. Have no anxiety at all*, but in everything, by prayer and petition, with thanksgiving, make your requests known to God. Then the peace of God that surpasses all understanding will guard your hearts and minds in Christ Jesus.
Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is gracious, if there is any excellence and if there is anything worthy of praise, think about these things. Keep on doing what you have learned and received and heard and seen in me. Then the God of peace will be with you*." Phil 4:4-9