It almost sounds like a revolutionary proposal - to just leave other people alone, to let other people's weight and habits not be any of your business, but this is what we teach five year olds. It's not that difficult to reserve judgement about people you do not know. Yet people really resist this idea that you don't have some sort of moral obligation to shame people for a trait when you don't know anything about them. It's strange how much push-back I get about this.