Is it part of the methodology of the righteous Salaf for a student of knowledge to be occupied with judging others?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: I have noticed that many students of knowledge today are occupied with pointing out the errors of others, or judging people by saying, "This one is ignorant," or "This one is mistaken," or "I know so-and-so well," and sometimes it reaches the point where he says, "So-and-so is one of the Khawarij." Is this part of the methodology of the righteous Salaf? And what is your view on this?

Answer:
It is not part of the sound methodology to be occupied with the faults of people, so that a person ends up with nothing but, "So-and-so is good, so-and-so is not good, so-and-so is such-and-such, and so-and-so is such-and-such." A person should be occupied with his own faults; he should be occupied with his own faults first. And if he sees an apparent error in someone, he should advise him in private and explain it to him, because this is part of giving advice, and religion is advice. As for speaking about people in gatherings, praising this one and criticizing that one, declaring this one an innovator and certifying that one as trustworthy, this is not permissible. A person should be occupied with his own faults and not look at the faults of others.
Second, if he sees a clear, apparent error in someone, he should verify that it is indeed an error, then go to him and explain the error to him. This is part of giving advice. He should not speak about him in gatherings or in his absence, as that would be forbidden backbiting. Yes.