Why do people feel that it is okay to bring their own drinks int

Stone Harbor - Why do people feel that it is okay to bring their own drinks into a restaurant that serves similar drinks. Whether it is water bother of mocho chocolato lattes or others, restaurants make money serving beverages. It is a little tasteless if they had to put up signs, “ no outside doors or beverages.” You would think that mature adults would know better. That is right up there with adult men sitting in a fairly nice place eating wearing a ball cap. Manners may sound silly, but having manners and politeness help build other good qualities which we seem to be lacking these days.