Is discussing the mistakes of preachers and pointing them out considered part of the science of al-jarh wa al-ta'dil (the critique and vindication of narrators)?

Question:
Honorable Shaykh, may Allah grant you success. He says: Is discussing the mistakes of preachers and pointing them out considered part of the science of al-jarh wa al-ta'dil (the critique and vindication of narrators)?

Answer:
No, it is talebearing and backbiting, and it is not permissible. This stirs up discord among the students of knowledge. If you see a mistake in a student of knowledge or a scholar, the remedy is to advise him privately between you and him. As for sitting in gatherings and criticizing people, this is not permissible. There is no benefit in it; rather, there is harm. People have divided into factions because of these matters. This is not permissible. Yes.