I think perhaps we, as a society, are in need of a refresher in Miss Manners common courtesy etiquette. In all domains from traffic to chat rooms people seem to have forgotten that there are other people around them effected by what they do. We seem to have forgotten that anger and entitlement are not decent reactions to every day minor annoyances. Perhaps what we need is to have it spelled out for us in a concise list of appropriate behavior so we become more aware of what it is we do and why we keep getting those sour faces and rude replies. I would not be against it being taught in school for a generation or two.
Image found here.