Actually, showing respect to scholars is an obligation upon every Muslim even with disagreement that one may have with them. This is because scholars are the heirs of Prophets from whom they inherited science and that is why they should be respected.
There are many proofs to cite in this respect. Almighty Allah says, ” Say (unto them, O Muhammad): Are those who know equal with those who know not?” (Az-Zumar: 9). Imam An-Nawawi cited a lot of traditions calling for honouring and respecting scholars. (An-Nawawi’s Riyad As-Salihin, pp. 187-192).
Dr. Rif`at Fawzi, former professor of Shari`ah at Cairo Univ., states the following: “Islam urges the Muslim to try his best to seek useful knowledge by consulting reliable scholars. However, when seeking knowledge from a person whom we trust, we are supposed to exercise remarkable politeness and avoid provoking the scholar. The Muslim usually asks about something about which he is not aware of, and thus he should receive the answer to his question with due care and trust as well. Moreover, it is an unbecoming from the Muslim to be haughty towards those from whom he is seeking knowledge.
Moreover, I would like to stress that sometimes, we may know the wisdom behind a certain act worship act or a thing in Islam, but at other times we fail short to grasp the Divine Wisdom due to our limited knowledge and shortsightedness.
All in all, we should exercise the due politeness with our scholars and have trust in their words as long as they are reliable and Allah-fearing.”