Is it normal that my brother disgusts me.

Meybe its stemmed from the whole the nightmare thing or that he said he finds incest books and anime hot (ugh.) but even more so i get really uncomfortable around him we use to be all close and that but now i find him repulsive and hard to look at let alone talk to, i get the feeling of wanting to beat him with a pipe and run, he said he doesn't want to commit incest but i just don't feel comfortable around him for some reason. I just feel digusted and all that. now is that normal or can you offer any helpful advice. I also suffer from intrusive thoughts about pretty disturbing stuff so any HELPFUL advice would be greatly appreciated.