Some people are unfortunate enough to have a physical condition which is noticeable to others. Maybe someone's hands shake due to Parkinson's Disease, for example. If you come across someone with a noticeable physical problem, don't be ignorant by pointing it out to them. They're already aware of their condition, after all. I knew a person who had a physical condition. I will not say what it was. This individual was very self-conscious about it. And every so often a customer at this person's job would point it out to this person. This person already knew about it. Having some customers point it out to this person just made it even worse for this person. I could see a young child being ignorant enough to point out a condition out to someone. But for a full grown adult to do so is so foolish and ignorant!