Funny you should mention that. At least on tumblr, for every bit of incest/blmatsu, there's people that hate it with a passion, and if you post it you will get some nasty anons. They're usually in the Matsucest tag, which I think is why most changed to blmatsu instead? (Source: friends with a week who was into that)
They seem to be fond of mob/gang rape by faceless people, though. Usually with a nice dose of emetophilia or piss.
It's a shame, because there are good artists in the fandom, but I guess Kara being swaggender and Tottiy being tranny matter more than enjoying the show.
Ohh, Tumblr.