You're all probably familiar with the concept of a troll. This is someone who will say anything they can to provoke a reaction from you. If you express any sort of opinion on the internet, it's a matter of very little time before you get 1 attacking you. If you make videos on YouTube, your appearance alone can give the troll ammunition for their insults. Take me as an example: I have relatively long hair for a guy and I don't shave often. My trolls have tended to target these features in particular. Anything that stands out from the norm tends to be a target. When it comes to women, these insults tend to take a more sexist form: for example, "get back in the kitchen". They will almost definitely make reference to your breasts or vagina or say "I'd tap that", as an extremely mild example. For these reasons, women are more prone to trolling than men. This is a perfectly legitimate issue to raise: even if the insults are insincere, the fact that one gender receives more, and that those insults are of a more sexist nature, is an issue that can be addressed. There are any number of reasons why this could be the case: perhaps trolls feel that women's rights are still a sensitive issue seeing as how any significant equality was only established last century. How women were treated before such progress was made gives them ideas. I don't think any female-specific body parts in and of themselves contribute to it because otherwise male-specific body parts would be targeted just as frequently, and that hasn't, in my experience anyway, been the case. Of course it could be that most trolls are male.
Now what does this have to do with Atheism +? If you look at the people who started or inspired the movement: Greta Christina, Jen McCreight, not to mention that Rebecca Watson's "Elevatorgate" incident was a precursor to the whole thing, they have all taken the above fact extremely seriously. They, perfectly legitimately as I said, see the fact that women are trolled more often than men as a gender issue to be addressed in our community. Every action by these trolls: every death threat, rape threat, sexist remark, or objectifying comment is taken very seriously. That's not to say that they don't understand that it's trolling, just that it doesn't matter if it is: it's still a problem to be addressed. Some people are doubtful that they receive such threats, but if you count every instance of trolling towards them in which someone says something like "I hope you get raped" as such a threat, is it really so hard to believe? Many internet personalities talk about their hate mail, many reading it out for fun. Why would you deny that the aforementioned people are any different? When Rebecca Watson, or someone like her, talks about these threats at skeptic conferences, these instances of trolling are what she is referring to. Atheism + is a movement reacting against such trolling, but also against the viewpoints that enable or encourage such trolling. Had they used a different name I wouldn't have a problem with them AT ALL. The behaviour, and the underlying mindset that encourages it, should be challenged; my problem with them is that they have taken that perfectly noble idea and framed it as "the third wave of atheism" (the previous 2 being philosophers that have championed atheism in the past and "New Atheism", referring to the more recent efforts by people like Richard Dawkins, Christopher Hitchens and Sam Harris).