I find fanfiction to foster an extremely conservative community, and I would argue that the genre is essentially the opposite of avant-garde. However, I'm extremely biased against fanfiction both in concept and execution, so my opinion will be distorted.

We basically agree on (b), but I guess the clarification that I thought was important was that while women are better at noticing the sexism of others, they are generally terrible at noticing their own (just like everyone else). You would think that forming groups would sort this out, but unfortunately people tend to form groups with those who share and reinforce their views (especially on the internet).