I'll go first

Wisdom is the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom. (Charles Spurgeon)

Anyone who rebukes a mocker will get an insult in return. Anyone who corrects the wicked will get hurt. So don’t bother correcting mockers; they will only hate you. But correct the wise, and they will love you. Instruct the wise, and they will be even wiser. Teach the righteous, and they will learn even more. (Proverbs 9:7-9)

We have many responses to a rebuke, don't we? Some of us will scoff and say you are wrong about what you think or say about us. Others will argue vehemently that you have made wrong decisions yourself, so how could you judge their actions as wrong? Some will find any rebuke as belittling, cowering as a child scorned, afraid of what others will think should they find out whatever it is about them that has now been exposed. When a child of God is rebuked, it is a definite sign they are loved too much to be allowed to continue in their folly.

We may not judge one another - it isn't our place to act as 'judge', but God does ask us to look out for the welfare of one another. We aren't just to turn a blind eye to another's wrong actions. As much as is possible, we must gently guide them back toward making wise choices. Does that mean we criticize or condemn their actions? No, it simply means we recognize their actions as contrary to God's commands and LOVINGLY seek to see them restored.

You teach the wise, not the fool. You bring insight to the righteous because you know they will embrace it and learn from it. When we look out for one another, we might see certain actions that are 'red flags' the other one may not see themselves. We find ways to point them in the right direction, away from those red flags, so they can be safe, secure, and at peace within. A word to the wise: Don't correct others for actions you have been engaging in yourself. Take care of your own sin first. Then, as God leads, become an example of his grace to those who also struggle with making right choices. We won't be able to help another learn until we have learned our own lesson first. Just sayin!