I borrowed from a good friend:

What's wrong with folks these days...

A man walks into a coffee shop and after his purchase, the man says “Thank you” when handed the order. The clerk says, “No problem.” And then:

“Don’t you young people say ‘you’re welcome’ any more?”

“You want me to say, ‘You’re welcome?’’”

“Yes.”

“You’re welcome.”

“Thank you!”

“No problem.”