I couldn't figure out the source of Sully's animosity.
ETA 5/25/15: I have now read some other reviews of this book and had some Twitter conversations. Please see this excellent post at Something More/My Extensive Reading, and be sure to follow the links, and if you're really interested, read the comments for truly enlightening discussion. Something More:
Also, I may have given the impression that I didn't like the book. While I found the book so uncomfortable to read that I'm resisting the desire/need to read it a second time, I'll go on record as saying that this would definitely be in my list of top 100 best-written fiction I've ever read, and honey, I've read a lot in my seven decades. It is masterful writing. It is amazingly subtle writing. I cannot imagine forgetting the book, and how I felt when I was reading it. I could talk about this book more or less endlessly because there is just that much to it. But I'm going to try to shut myself up. :-)