TV Host Bill Cunningham Sued -- You Hate Muslims!

TV talk show host Bill Cunningham doesn't have a shred of common decency -- or a clue about the Constitution -- according to a woman who says he humiliated her over her religion.

Nicole Johnson -- a devout Muslim -- says she attended a February taping of "The Bill Cunningham Show" in NYC wearing a traditional head covering -- a hijab -- as her religion requires.

Johnson claims in a new lawsuit -- obtained by TMZ -- show employees forced her to leave her front row seat and sit in the cheap seats ... because they didn't like the way her hijab looked. She also claims she was prohibited from asking a question during the show.

Johnson says she suffered mental anguish and embarrassment.