I believe that. My first-pass filter for theories of why some people think SIAI is "arrogant" is whether the theory also explains, in equal quantity, why those same people find Harry James Potter-Evans-Verres to be an unbearably snotty little kid or whatever. If the theory is specialized to SIAI and doesn't explain the large quantities of similar-sounding vitriol gotten by a character in a fanfiction in a widely different situation who happens to be written by the same author, then in all honesty I write it off pretty quickly. I wouldn't mind understanding this better, but I'm looking for the detailed mechanics of the instinctive sub-second ick reaction experienced by a certain fraction of the population, not the verbal reasons they reach for afterward when they have to come up with a serious-sounding justification. I don't believe it, frankly, any more than I believe that someone actually hates hates hates Methods because "Professor McGonagall is acting out of character".