Hes not being arrogant at all. He is pointing out the fact that the indoctrination and brainwashing of children is bad. Isn't that always a bad thing no matter what belief system is involved?
Ill give you some arrogant atheist: I think that the christian religion is disgusting, stupid, pathetic, and for the weak minded. Also, I believe that atheists, agnostics, free-thinkers, and anyone who doesn't subscribe to a fixed/unchanging belief system is more mentally sound than any religious person.