As I understand it, ‘Good morning!’ is short for ‘I wish you a good morning.’, not ‘I’m having a good morning.’. It’s not a lie if you’re in a bad mood, but it may be a lie if you say it to somebody that you dislike.
As I understand it, ‘Good morning!’ is short for ‘I wish you a good morning.’, not ‘I’m having a good morning.’. It’s not a lie if you’re in a bad mood, but it may be a lie if you say it to somebody that you dislike.