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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.
My old man used to say (in a sing-song voice):
Hay is for horses
Sometimes cows
Chickens would eat it
But they don't know how
im old but you are most definitely older than i