> I got confused because the parent post mentioned the "downfall" of "the Atheist community in the US"

Yes, I was the person who wrote that, and this is what I meant.

> as opposed to an outspoken atheist who said something stupid online and got publicly ridiculed for it.

... which then resulted in infighting over if it should be ridiculed, a mass exodus of the thought leaders, and general dwindling of the community. Seriously, Dawkins was shunned by major atheist conferences over his comments in my earlier link. Many atheists then shunned those conferences for shunning Dawkins. When's the last time you saw new material on athiesm in the news? Your answer is almost surely "before elevatorgate"

Ah, see, I don't view atheism as a community or as a political movement. It's just a personal believe (or lack thereof). And I don't see any evidence that this has declined.

There is an atheist community no doubt about that. The bright movement was a good example and then followers of Dawkins, Harris Hitchen et all which roams places like Reddit are by every definition of that word a community with a shared amount of argument, interest and an idea of outside the community.