I have witnessed this problem many times, it may not be what the verse is talking about, but I have at least personally related to what I have observed to it.
I have heard many people talk badly about their parents, hating them for what they did, and to our senses it is justified. However, in every case (of what I have observed personally) when that parent dies, the child who hated that parent is filled with guilt and a sort of death over comes them.
In each case I have observed it did not matter how bad the parent actually was, the child who lived a life of hatred and contempt towards that parent was deeply affected negatively. I believe this is because once the parent dies the child realizes that no reconciliation on earth is possible, not only will the parent not be able to be sorry for what they did in this life, if the child realizes things they did wrong it is also impossible to reach reconciliation.
That is very damaging emotionally. I came to this belief in time and have forgiven my parents and have made the effort to treat them with respect whether or not anyone might think they don't deserve it.
At the very least when my parents pass away, that deep regret will not poison me.