Woah I just read an article in Psychology Today about that. It's true. We're not friends with people because we care about them; we're friends with them because they make us feel good about ourselves, offer us support, and remind us who we are.
I think Gandhi and mother theresa are human too, so they are subject to human nature. Maybe they just have this faith in JESUS or their supernatural being they believed and make them to be self-less. That's only my opinion:)+
I think you are pretty much right. If you are talking to them they arn't listenimng they are preparing an answere to what ever you said. or they are interuping because what you had to say is of no concequince