Atheists turning to cult behaviour?

[Thumpalumpacus]

We just say 'that particular atheist community is not somewhere I'd like to participate', and find somewhere else to participate.

Well yes, I could always just go somewhere else. And that's what I have done for now. But it doesn't make the problem go away, and I'm hoping something can be done about it.

The obvious strategy would be to speak up when and where you see it, rather than make generalizations about "most atheists" and making incoherent comparisons to cults.

I've been involved in Internet atheist communities for sixteen years. My own personal experience is that atheists are no more likely than theists to be sexist bigots. This is borne out by my experiences in real life with atheists.

And when you look at thing like the allegations against Dawkins, Myers and other atheists were vigorous in their pushback against rape and for equal treatment of women.

I think the thing you're overlooking is that in-group/out-group behavior patterns are deeply wired into humans, and are often reinforced by upbringing. I'd like to see some firm data showing "most" atheists do this or that. I'd also like to see exactly what you mean by "cultish" behavior, because atheism as a movement is nowhere near that centralized, organized, or powerful enough to enforce teachings upon followers.

I think you're making an overbroad generalization, and ignoring the deeper roots of misogyny and homophobia.