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Nobody says it anymore
(startrek.website)
I've heard it explained that "hey" used to be more of an urgent way to get someone's attention, rather than a casual "hello" like it is now, so it sounded rude to some older folks.
In my language, "Hi!" sounds like "Shark!", so sometimes I have to suppress the urge to say "is a fish", because Gen Xs I knew used to say it all the time.
Germany? We have "Hai" "Fish" "Flosse" "Suppe" as a back and forth thing. Sharkfish fin soup.
Always fun to find someone who knows the full game
Haj