What is the ruling on keeping the company of one who slanders scholars, and sitting with one who declares rulers to be disbelievers under the claim of Islamic brotherhood?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: Is it permissible for a person to keep the company of one who belittles the status of scholars and follows those preachers whom he has rejected, or whom he has repeatedly refuted? Or if he sits with one who declares rulers to be disbelievers, claiming that this person is his brother in Islam? What is your guidance for these people?

Answer:
Any fitnah (trial, discord or temptation). This is like the answer to the first question. If he has an influence on him such that he returns to the truth and abandons these matters, then you oppose him, advise him, and change his behavior so that he may err less. But if you have no influence on him and he does not accept, then do not keep his company, because he is a bag of... If he does not accept advice, or from the gatherings of longing, I ask you...