[@Ammokkx] Tsukiko would probably whack Hayato over the head with her fan for acting just like her stubborn brother. She knows full and well that talking back to a teacher and insulting them is a bad idea. Hence why Shinrei got exactly what he deserved for being a jerk to everyone. I wonder if Ethel or Haas got a glimpse of that. 

Though Shinrei might sympathize with Ethel only on the account he also has an annoying person who won't leave him alone either.