I was re-reading Jay Cantrell's Unending Night, and came these lines.
"Every time I've thanked you, you've replied you were glad to do it Most people just say 'you're welcome.'"
"That's why I don't, Andy said with a shrug. "'You're welcome' just seems so trite, it's like it has no meaning anymore."
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My experience is different from Andy's. I rarely hear anybody say 'you're welcome' any more. What I hear is that when one person says 'thank you,' the other is more likely to respond, 'Thank YOU." Or 'No problem' or just a nod instead of a verbal response. Instead of finding it trite, I find it refreshing when somebody actually responds with a 'You're welcome.'
In considering dialogue in a story, would my preferred response seem out of date in today's world for a young character whose family has always insisted on manners and politeness?