John Phillips Marquand once said (or wrote):
When I'm writing a novel, I'm dealing with a double life. I live in the present at the same time that I live in the past with my characters.
It is this that makes a novelist so eccentric and unpleasant.
Yes to the first sentence.
I don't find that writers for children and young adults become unpleasant at all. It must be older male writers who write books for adults? (yes, I've run into some of those.)