A cognitive bias in which a subject is judged negatively as a whole based on a single and often circumstantial component. The opposite of the halo effect.
Bob: You’re going to see the new Sex and the City movie? That’s going to suck!
Kate: No, it isn’t. It’s just you and the pitchfork effect.
Bob: You listen to Lady Gaga? How about listening to some real music for once?
Joe: I could care less about your taste in music; that’s just a pitchfork effect.
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