[It's not so much that it's unconscious, so much as he doesn't think about it when he does do it. It's habit enough that he barely notices it without it being pointed out. Also, he's probably never heard it referred to in the way Hibiki is referring to it, and has never met someone who objected to it so stridently - which, as a result of all things combined, means he's completely missing what she's talking about.]
no subject
[It's not so much that it's unconscious, so much as he doesn't think about it when he does do it. It's habit enough that he barely notices it without it being pointed out. Also, he's probably never heard it referred to in the way Hibiki is referring to it, and has never met someone who objected to it so stridently - which, as a result of all things combined, means he's completely missing what she's talking about.]