I have just finished reading this and found it traumatic as well as frightening. Was Kevin a product of his mother's rejection at birth, her frosty attitude towards motherwood and her nihilistic, supercilious assertions that she was better than everyone else? Or was Kevin innately cruel, insensitive and lacking in empathy? I think it was a combination of both and I certainly think that ultimately, Kevin was a sociopath and misanthrope.
Also, at the end, despite their fraught relationship, I felt that Kevin did respect his mother, in his own convoluted way. On the hand, he clearly despised his father who went over the top, imo, with his buddy-daddy approach to fatherhood and seemed completely oblivious to Kevin's sneers and derisions of him.
This is the first book that I have read by Lionel Shriver and will be reading more of her books in future.