I think the only answer you can give besides pointing out that, hey, there are plenty of violent, militant theists who have actually killed people they disagree with over cartoon pictures, books and films intended to educate, and that youtube comments (whilst vicious and deplorable) are hardly of the same caliber, is NO U or SO I HERD U LIEK MUDKIPS since it's not actually that useful a thing to talk about.
atheists may get insulting, theists do too, but don't go pulling out the whole "you bunch of X hating Y-ists killed all my Z's", you'll just Godwin the thread from the very first sentence.
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