If I ever got refused I think I would laugh and call them an idiot to be quite honest.
Although my Muslim flatmate (who drinks alcohol...) once was looking through my Sainsburys bag, picked up my ham and quickly put it down with a look of disgust on his face. I said to him "are you an idiot? its in a packet" in a joke sort of fashion, and he just said that he "cant" so I do wonder if theres something about handling it?
Anyway still ridiculous, poor little piggies