In the US, certain things are ritual greetings that follow a standard script. Deviating from it is considered a bit weird (but it’s also common, and possible to get away with. I deviate from it often).
“How are you?” is not usually intended as a real…
Yeah, it’s really an Anglo thing, I think. My parents soon learnt not to ask “hi, how are you doing?” unless they actually wanted to know someone’s complete medical history, because not everywhere is as odd as the US and UK in not being literal, lol.
Good to know.