Enforced: "Let's teach the kiddies the ever-popular 'don't judge a book by its cover' lesson."
Invoked: "I say, I dun like that Bob feller. Son, you best not go near him, lest he eat your face off."
Deconstructed: After the rumors that Bob is a freak get spread enough, they start to get ingrained in the society's consciousness. As a result, Bob is unable to be treated as anything but a freakish monster.