Image from Google Images
Is it just me, or has anyone else noticed that people rarely say "you're welcome" any more. The response to a "thank you" is more likely to be "that's okay" or "no problem" or "you bet". The truth is, I started to notice myself saying "you bet" in response to a "thank you" which led me to notice that others were also using a more casual response.
I don't know the origin of the "you're welcome" response, but I take it to mean that you may, or that you are welcome to, ask for whatever you need and I will be glad to accomodate you. If someone says "no problem" I take it to mean that whatever they did for me could have been a problem, but fortunately was not. My own "you bet" response sounds like I'm just ready for you to go away now.
I know, I know, it's no big thing in the big picture and the idioms of a language tend to change over time. I guess I should just be glad that people still (usually) say "thank you".
What do you respond when someone says "thank you" to you?