Oh I remember seeing a post on this guy making the rounds on Tumblr a few weeks ago. This guy's disliked by other pro-shippers for his support of actual incest. Bunch of big-name pro-shippers blocked the guy and refuse to associate with him after he came out in support of real incest. I can't find the post that prompted the mass blocking, I'm looking for it now and if I find it I'll share it.
Where pro-shippers say 'yeah it's weird, but we don't condone or support it in real life and it isn't hurting any actual people, so whatever as long as it's fiction', this guy has come straight out and said 'why can't I fuck my brother?' Even other incest shippers want nothing to do with this person.