I wouldn't say he seemed to hate Kikyō. Rather, he was bitter about what he thought she did to him.
As a hanyō, Inuyasha was never accepted by humans or demons, so acting tough, arrogant, and untouchable while never getting close to anyone was simply a way of life for him. But then he did get close to someone, and it all backfired on him terribly. By acting like he and Kikyō were enemies, he was just slipping back into the role he always played (him against the world). Villainizing her this way also helped him to cover and deal with the sadness and pain he felt. Damaijin (talk) 04:49, May 27, 2013 (UTC)