While I agree with your point, it's really a matter of a general attitude that they have in regards to people that think differently than them. In my experience, it's fast worse than people of faith.
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I think it's probably born of frustration at the fact that a lot of atheists can only speak out on the internet where they have the luxury of anonymity. Don't forget a lot of these people come from places where they are spurned for they lack of faith.