That's really frustrating Allison. I know I'd have a hard time not hollering at friends who don't care for their pets as they should. Some people think if any animal as disposable unfortunately. All you can do is keep trying to educate them or simply refuse to be friends with them if they upset you. Other than that, if the situation is horrific, you can always inform your local animal control officer but that's a hard step to take when it comes to friends.