What do you mean “aren’t good”? They totally can be.
the person asking “what do you mean” got confused about the nuances of verbal and non-verbal communication.
Nearly all people understand that “good morning” does not state the fact of the current morning being good, but a greeting with a wish for your morning to be good.
The answer “mornings aren’t good” is an intended pun using the too-literal meaning to convey the message that the person does not like mornings at all. Depending on intonation it might be a cheeky comment or suggestion that they are not good because of the person greeting (f.ex. if they need to wake up early because of them every day).
I think that in exchange:
Good morning!
Mornings aren’t good.
What do you mean “aren’t good”? They totally can be.
the person asking “what do you mean” got confused about the nuances of verbal and non-verbal communication.
Nearly all people understand that “good morning” does not state the fact of the current morning being good, but a greeting with a wish for your morning to be good.
The answer “mornings aren’t good” is an intended pun using the too-literal meaning to convey the message that the person does not like mornings at all. Depending on intonation it might be a cheeky comment or suggestion that they are not good because of the person greeting (f.ex. if they need to wake up early because of them every day).