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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.
To me “you are welcome” comes off as taking credit for something minor and expected. No problem does the opposite. I prefer when people say no problem generally over you’re welcome. And that’s why it’s become more common in a day in age where people are expected to be less servile.
Question for the Spanish speakers in the room: Is there even another term equivalent to "you're welcome" other than de nada that people actually use? Not super familiar but Spanish seems like a language where "it's nothing" or "no problem" has almost completely replaced other phrases responding to thanks.
Asked honestly and noting cultural differences that may apply here - could be there's a more formal "you're welcome" Spanish phrase and I've just never heard it. 'Cause, you know, I don't live in a Spanish speaking place.