Are atheists who are online different from the typical atheist? Are the most vocal really representative of the group?
Interesting article. Going by my personal experience, I have noticed a difference between online atheists and offline atheists among my own social group.
The majority of the people I spend time with are either atheists or roughly fall into the spiritual not religious category. For the most part, they're just not all that interested in religion. Those who are more willing to discuss it don't have much of an emotional investment in it. I actually got my copy of
The God Delusion from an offline atheist who saw it as little more than a prolonged rant that he had no interest in finishing.
So they're nothing like the New Atheist stereotype... except for one.
The online atheist I know personally is so hostile to religion and theism that it veers into outright bigotry. He'll post rants on Facebook about how stupid believers are, he shares all those cringeworthy atheist comics/memes and generally makes it clear that he views himself as superior to the sheeple.
There are a couple of things about him that I find fascinating. Firstly, his actual knowledge of religion and theism is shallow and honestly a little juvenile. He's very much a proponent of the view that Christianity is bad and therefore religion is bad. Secondly, since most people around him are largely apathetic to religion, he's really just screaming into the void.
If somebody's online interactions with atheists were mostly restricted to people like him and they didn't know many/any offline atheists, I could easily see somebody taking a dim view of atheists as a whole.
(Quick note here that RF is a whole different game to Facebook as members are expected to hold themselves to a much higher standard).
Also as others have mentioned, the offline/online dichotomy applies to far more than just atheists. Football immediately springs to mind here (that's football football not handegg football) as I know plenty of people enjoy watching it but most of them don't talk about it online. Those who do can be pretty tribal about it.