Observation ~ many times when a person is trying to be friendly, they will ask you questions, such as "how are you?" or "what happened?".
It is puzzling when, as you respond to their question, you receive 'metamessages' of disinterest (the person is easily distracted, starts browsing through a book, etc.).
Is it a social convention to seem interested in others?
Is it that they want you to feel that they care, even if they don't?
What a joy it is to care enough about another so much that you spend time only listening and talking when you want to, and about things you want to talk and listen about.
~ How rare to find!
The old saying "It is better to be thought a fool than to open your mouth and confirm it"; it means you will not be accepted for speaking your mind carelessly.