It's just professional respect. Some also call it etiquette.
There are even courses of proper communication that teach that. It's those small things that makes your communication better. So it makes sense.
You could say that not greeting your boss also make no change as it's not needed for work. But to me it seems common sense to greet people i know when i meet them.
If a tweet (or similar) makes a statement of fact, either mark it as "satire" in the body or provide the original source link backing up the statement (see rule 6)
It's just professional respect. Some also call it etiquette.
There are even courses of proper communication that teach that. It's those small things that makes your communication better. So it makes sense.
You could say that not greeting your boss also make no change as it's not needed for work. But to me it seems common sense to greet people i know when i meet them.
Others would call it pettiness
People can be rude in many ways that is true