I'm in DW/TW fandom, and notice pretty much ZERO overlap between a) people who will actually speak up and meaningfully complain about media representation of racial/sexual/gender/other minorities, either in shows they like OR in shows they don't like and b) people who bash characters like Gwen and River Song. So this post would make a lot more sense to me if there were names and links and arguments quoted.

Another point of confusion would be that I have no idea what your definition of "social justice" is. Because as far as I can tell, the term is almost as meaningless as "politically correct" in that people on LJ/DW are starting to use it to mean "anything I personally don't like".

Also, being the change doesn't preclude critical thought. You can do both at the same time. You're setting up a false dichotomy.

I'm totally sympathetic to the point of your post as it relates to pointing out a certain levels of hypocrisy and inconsistency between speech and action in fandom. I see that happening in Torchwood fandom around issues of homophobia, Ianto's death, the whole complex there. But I don't see what you're describing has to do with "social justice". And you're also describing a widespread situation where people "get credit" for pointing out representation problems. And I don't see that. I really don't. It certainly hasn't been my experience.