As a huge supporter of Rand I don't see how admitting to a lack of knowledge on a particular topic and seeking to gain that knowledge is a form of self-depreciation in any way. In reality, I would argue that to continue on in life with the perspective that you are all knowing is more detrimental to one's self than reading a book to further one's knowledge, regardless of a book's title. I don't imagine any self respecting person would call themselves dumb, however, reading a book for personal gain is never going to hurt you. I also find it hard to imagine a self-righteous person being an opponent of Rand.