Seriously, I am sure there is a pshychological explanation to his behaviour. We don't know whether he was kicked out by his parents or removed because he was abused, but either way his reluctance to leave FoD has a strong relation to this - he doesn't like the idea of others removing him from where he wants to be. He feels that he
belongs
here, which is why he makes up stories about being the best and having many friends.
I don't know if he is blind to the truth, or just using FoD as an alternative way to rebel at his parents. I am sure the anger we see is subliminally aimed at his parents for whatever happened in the past.