In Great Expectations, why is Pip unable to notice Joe's intelligence?

In much of Great Expectations, Pip is fixated on social climbing. He accepts his society's valuation of people based on their social status. People who speak the right kind of English with the correct accents, have expensive educations, the right pedigree (parentage and ancestors) and a hefty amount of money in the bank are considered by Pip, like most of the rest of society, to be more intelligent than a humble and modest blacksmith who speaks in a local dialect and has not had much formal education. Pip, flush with expectations from the mysterious benefactor who is setting him (Pip) up as a gentleman, confuses education and arrogance with intelligence. For a long time, he finds it impossible to see past Joe's outward packaging to the truly generous heart and sharp mind of this man who is at the moral center of the novel. Pip's real growth and education (maturity) occur when can look past shallow outward wrappings to the true worth in people and things. Then he can appreciate Joe.