Why woudn't he be angry at Eto? She's the leader of Aogiri which is a danger to both humans and ghouls, she's letting Kanou the guy who turned him into a half ghoul maken even more of them and also when he asked why she was at the Tsukiyama extermination she says it was to see him, Tsukiyama and Kanae killing eachother. I can't wait until he finds out what she did with Yoshimura that's when he's going to be really pissed off.