Well, this is the reason that when you go into a hospital, you do the shitlording for the nursing staff. Because they can't. And as a patient, being a shitlord is merely a part of your hospital experience. If an obese person complains about you being rude simply let the staff know that the fatty is causing you patient dissatisfaction, creating a hostile patient environment and you think they're stealing your snacks.  Immediately file a complaint.