The Ruling on Backbiting the Open Sinner and One Who Displays Sins

Question:
Some people cite the hadith: "There is no backbiting of an open sinner?"

Answer:
No, I do not know the authenticity of the hadith, but it is known from other evidence; the Prophet (peace and blessings be upon him) said regarding the man who came to him: , they cite this to prove that one who displays sins is not subject to backbiting.
But the believer should be cautious; it may be that in his backbiting, he is exposing corruption that leads to evil, and it is better to advise him and guide him than to backbite him, as much as possible.
But the sin of backbiting only occurs with one who has not declared his sins; as for one who declares his sins and displays them among people, drinking intoxicants among people, not praying with the congregation, there is no backbiting regarding what he has displayed; smoking in the markets among people, there is no backbiting; shaving his beard, people see it, there is no backbiting; but if he sees it in the interest of advising him in secret, and not speaking about his honor, perhaps he may be guided; this may be better, and great good may result from it.