He definitely has that arrogance and entitlement complex that some Really Smart developers tend to have. I kind of got this impression from his email, especially when he postulates that competitiveness and self-reliance are traits of excellent developers while being collaborative and people-oriented are traits that bad developers have.

Once I saw him in this video, it became pretty clear that he's one of those entitled developers that you really don't want to be stuck on a team with.