Looks that way. He does possess an ego that simply doesn't have a filter or any layer of humility clearly. Maybe he once did, probably when he was an infant. I've never equated it to some underlying mental illness but who he is as a person. Some people, especially if they have people around them to encourage their inflated pride, are mad on their self–worth and value to humanity. It always makes for bizarre entertainment.He's a publicity whore, much like his wife and her family, they just have different ways of going about getting it.
Personally, I think he knows exactly what he's doing and it is very carefully calculated and planned.