Look. Kiyoko is pummeling the guy that her, sort of, girl-crush has feelings for. If Kiyoko was a guy, we would find the behavior appalling, or at the very least pathetic, but since Kiyoko's a girl, and "certain" people on this site would rather have Shibuki develop feelings for Kiyoko instead of Naruse, we're supposed to find it endearing and humorous.