While extremely disappointing to see, the latest example of sexism in the online atheist community has nothing to do with atheism. Or our community. Whatever personality defect that causes people to behave in this manner online (we all know full well that internet assholes don't have the balls to say things like this in real life) is not at all related to their intellect or belief-system. They don't represent us, and I kind of wish the major bloggers (Greta, Jen, Hemant, etc.*) would leave it alone. Every online community has this problem. It's not going to go away. All we're doing now is feeding the trolls, and they're reveling in it.
I speak from experience, having formerly been a member of an online community dedicated to the following of a particular jam band where everyone was faaaaamily and good vibes were spread and a bunch of other hippie horseshit. The comments in that Reddit thread are similar to some of the stuff I used to read on those music boards.
If we, as a community, want to give this any kind of attention, I'd recommend really going after these guys. Writing about the need to rid our community of this kind of activity isn't going to work. Finding an atheist over at 4chan and asking them to do what they do best might. ;-)
*No disrespect intended towards these guys at all, and it's possible I'm just jaded given my previous experience with this sort of behavior. Bleh.