1340
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.
And we don't give a fuck about you thinking we sound like a fifth grader.
Your existence is meaningless and has no influence on the world, let alone our lives, fr fr no cap.