What is the position toward one who permits what Allah has forbidden and disparages some of the Companions?

Question:
The questioner says: We are a group of young men, and we hope you will answer this question of ours because the affliction has become widespread. We have a caller who claims knowledge and says that it is obligatory to focus on tawhid al-rububiyyah (oneness of lordship) in this age, and that it is permissible for a woman to travel without a mahram (a relative one may not marry) to seek religious knowledge in coeducational universities. He disparages some of the Companions, such as the Rightly Guided Caliph 'Umar ibn al-Khattab (may Allah be pleased with him), and says that he represents the opinion of the ignorant and unjust. He also hints at two scholars of this land (may Allah have mercy on them). The question is: What is the religious position that must be taken with him?

Answer:
The religious position is that you leave him and do not consider him to be of any account. Leave him and avoid him. Perhaps Allah will grant him guidance, or perhaps his harm will be upon himself only. As for you, leave him; do not sit with him, except if he repents to Allah and abandons these matters. Yes.