I welcome a chat and coffee with others, and also my own time. I guess the trick for others is to know when to approach and when to wave hello and move on. I don't blame people for intruding though, I mean it's a public place. I played it up a little in this post. Had I wanted complete solitude I wouldn't have been there.
We all need, or should find, time for ourselves. These days it's so easy to get bogged down with unimportant stuff and finding the ability to shut it out is important.