Disgust is a powerful motivator and influencer. It's an evolutionary survival trait we're wired to feel it easily and pick up on others felling it. Eww, this ham is awful. Everyone does a double-take, and many will perceive it as bad and consider throwing it out simply because someone else's judgment passed it as nasty.

It's VERY easy to get many to feel disgust against something simply by pointing at it and saying it's disgusting. You point out a few things and make a face, neanderthal brain says you know they're likely onto something.