He was wrong about that. Humans tend to be wrong from time to time and say stupid things. That’s just how it is. He certainly, however, wasn’t foaming at the mouth or being a dick.

I don’t always like what Dawkins has to say (which, I should add, is perfectly normal – I do feel that way about most people) but I don’t think you can call him arrogant in general. Most of the time he is very polite in what he says.