All of my experience with so called atheists have been on non religious forums (with the exception of this one). A lot of people where I live believe in a higher power but follow no religion and are pretty respectful people. Never met a person who "believed in nothing" in person though. I find it ironic they believe religions to be the root of all evil yet whenever a religious thread pops up they insist on posting the most vulgar of words, drawings, and videos. They want religious people to be more accepting and tolerant to other people's beliefs yet, hypocritically, they feel they are the exception to the rule. I'm not sure why anyone would want to meet someone like that in person.
Again, I'm speaking on my experience from non religious forums.