Personally I think that's natural, shitlady. As humans we're naturally predators and thus reasonably protective of our food on some level. When people are in our social network (IRL one) we'll be comfortable with varying degrees of food sharing depending on how close we are to people. But when a stranger encroaches upon our food then we immediately become protective and defensive.  By contrast the fats are like cattle. They graze and eat whatever happens to be near them.