“Good morning” is a term of welcome. “Good Night,” when said at night, is a term of leaving. You’d never say “good night” to someone who shows up at 11 pm for a party. Nor would you say good morning to someone leaving your house. Have a good morning, sure, or have a good day. Good Day is another term used while leaving. Then there’s Good Evening, which is the Good Morning of the night.
TL;DR Anon’s flame dashboard said good night, and he’s overcaffeinated and underslept and noted some wierd shit going on with wishing people Good [timeofday]
Another thing, “good morning” can be a whole conversation, you can say “good morning” to somebody and then not talk to them anymore. But if you say “good afternoon” or “good evening” I feel like there’s an expectation that you have something else to say. Is that just me?