Reply #3: I've known people who live like that.

[NightTrain]

Every one of them was an older person (40s-60s) who lived alone, had never been married, was unemployable due to a disability (physical and/or mental), and was pretty much clueless about the world outside their own little piece of it. Also, they were all articulate, intelligent people with whom you could have a highly stimulating conversation, albeit only about a limited number of subjects.

At first, I felt kind of sorry for those people, but eventually found them terminally annoying. As such, I ended up severing contact with all of them.