I suppose that most queer people largely agree on issue such as sexual rights, adoption rights, famility rights, etc. After all, being queer refers to pattern of preferences and behaviors, while being an atheist refers to an epistemic state.
I'm not sure the situations are all that different, except that "movement atheism" is younger. (I speak here mostly of the U.S., since it's what I know.)
Queers, for example, are significantly divided on questions of family rights. There are those of us who endorse the existing legal structure around families, for example, and want that structure expanded to include us. And there are those of us who reject the existing legal structure around families altogether, and want it eliminated.
That said, that division isn't terribly visible from a mainstream perspective; there's a relatively coherent political platform that gets treated as "the" queer rights movement, and most people go along with that.
I think a lot of the formalization of queer activism comes from its alliance with political parties. Because the major political parties in the U.S. have taken differentiable stances on queer rights, queer activists have de facto allied themselves with the Blues and opposed the Greens. (This causes some difficulties for queer people whose political or economic ideologies naturally incline Green. There is in fact a Green queer movement, although it doesn't get a lot of respect from your typical queer-on-the-street.)
I suspect that if atheism becomes a differentiable Green/Blue issue we'll see a similar pattern over the next thirty years. And it easily could... religious pluralism is increasingly becoming a differentiable Green/Blue issue in the US, which seems related.
One of the lessons highlighted in the thread "Less Wrong NYC: Case Study of a Successful Rationalist Chapter" is Gender ratio matters.
There have recently been a number of articles addressing one social skills issue that might be affecting this, from the perspective of a geeky/sciencefiction community with similar attributes to LessWrong, and I want to link to these, not just so the people potentially causing problems get to read them, but also so everyone else knows the resource is there and has a name for the problem, which may facilitate wider discussion and make it easier for others to know when to point towards the resources those who would benefit by them.
However before I do, in the light of RedRobot's comment in the "Of Gender and Rationality" thread, I'd like to echo a sentiment from one of the articles, that people exhibiting this behaviour may be of any gender and may victimise upon any gender. And so, while it may be correlated with a particular gender, it is the behaviour that should be focused upon, and turning this thread into bashing of one gender (or defensiveness against perceived bashing) would be unhelpful.
Ok, disclaimers out of the way, here are the links:
Some of those raise deeper issues about rape culture and audience as enabler, but the TLDR summary is:
EDITED TO ADD:
Despite the way some of the links are framed as being addressed to creepers, this post is aimed at least as much at the community as a whole, intended to trigger a discussion on how the community should best go about handling such a problem once identified, with the TLDR being "set of restraints to place on someone who is burning the commons", rather that a complete description that guarantees that anyone who doesn't meet it isn't creepy. (Thank you to jsteinhardt for clearly verbalising the misinterpretation - for discussion see his reply to this post)