I think that part of the problem is the range of ideas. If there was a section about Communism, you'd find a range of people from those who've read every political treatise on this, to those who just think it must be nice to share.
The same is true in FWR. Since going on that board I have been reading a lot more fem. writing, and there are some things that are just 'givens' if you've read the lit. Other people are just talking about their own ideas and experiences. It can make debate difficult as people are coming from such different backgrounds, even if they agree on what they want to say.
e.g. the concept of 'other'. If you've read Simone de Beauvoir then you get what is meant when someone says 'you're just saying that because you see me as other'. If you haven't read it, or don't know the concept, then that sentence doesn't even make sense. It's frustrating for both sides when trying to discuss along those lines.
I try to cite (or at least know the author, if not full ref.) of some things, but that can sound very condescending.
Sorry, Gin, I hope this feels like a discussion and engagement with your main point, not an invasion.
And yes, in every political arena, there will always be some who just like to be shouty, but I don't think that feminists are alone in that.