Pigs are smarter than dogs. They learn, and get attached, and play, and get in trouble.......why do we sit by at let this happen? Learn where you food comes from and demand better. You don't want this in you.
Unless you've crawled inside someone's skin and felt the words that claw away at their throat and suffocate them during the night, you have no right to tell anyone to get over it or that they shouldn't be upset.