Maybe it's the various permutations of the way people say toon. It's very easy to turn the double-ohs into an elongated, strained toooooooooooooon that stings your ligaments. I don't hate people who use the word, of course. There would be too much hate in the world. My Sha would consume Pandaria, Azeroth, and escape into the Titan's living room, sit down, and watch the game with Sargeras. You are not the problem; my weird aversion to the word is.
Obviously I don't hate the word that much -- it's just not my preferred term. So what is it with the word toon? Change my opinion, give me a comment spanking, or rally behind my unknowable and toon-phobic sentiments. Please, sound off on the word toon.