No Problem?!

Just returned from dinner, where the server said to us over and over when we thanked her for , our water, wine, bread..."no problem", even at the point where she brought us the check. " No Problem", that's when I thought to myself: "Of course it's 'no problem' I'm giving you money for services rendered, why should there be any problem?" "In fact I'm going to give you a tip so again no problem." How is it that these terms slip into our daily speech without so much as a second thought? Why is it that after hearing it for 25 years I'm now annoyed?