So the punchline ends up being that Hibiki is not an equal-opportunity greeter after all.

I guess when it comes to a superior or someone in higher grade, the greeting is more formal.

firechikara said:

I guess when it comes to a superior or someone in higher grade, the greeting is more formal.

Or she doesn't like the Admiral, or she's a lesbian, and won't kiss guys.

firechikara said:

I guess when it comes to a superior or someone in higher grade, the greeting is more formal.

She should at least salute if that's true...

firechikara said:

I guess when it comes to a superior or someone in higher grade, the greeting is more formal.

Actually the way she says "good morning" in Japanese is quite informal here.