Riyad Us-Saliheen (Gardens of the Righteous)

Chapter 321
Prohibition of Conferring a Title of Honor upon a Sinner, a Hypocrite, and the Like

1725. Buraidah (May Allah be pleased with him) said: The Messenger of Allah (PBUH) said, "Do not address a hypocrite with the title of chief, (or similar titles of respect) for even if he deserves this title you will invite Allah's Wrath by using it for him.''
[Abu Dawud].

Commentary: A sinner does not deserve any respect. His respect amounts to inviting the Wrath of Allah. Hypocrites, innovators in religion, disbelievers, polytheists, atheists, heretics and those who disobey Allah and His Prophet (PBUH) fall in this category, and none of them deserve any respect. It is the Muslims, the pious and those who are faithful to Allah and His Prophet (PBUH) who are worthy of respect.