I've come to the same conclusion that Lewis has. At least, it's the only conclusion that allows my brain to not explode whenever someone says it to me or when I think about people saying it. Those who are not quiet introverts will probably not understand how it is to have people say something so meaningless to you, but it does happen. A lot. So, if you are a person who says it to people, please don't. It's completely unnecessary and irritating. If you do end up saying it to me, however, I will take it as a compliment.