I do not believe you can have good manners without use of the appropriate language. A gesture done in assistance or to please should be acknowledged with a kind and appreciate response. Why? Because the action shows thoughtfulness. Children are not being taught manners but are instead subjected to extensive examples of sarcasm and outright meanness in movies and television. It's very sad and doesn't bode well for future generations of Americans who are already considered rude by folks around the globe. Thank you for writing about this topic and providing a forum for discussion.

P.S. I will use "no worries" when someone apologizes to me, for example, if they bump into me and I am unhurt. I did once call a man a lummox when he stepped on the heel of my orthodic slipper I was wearing after bunion surgery.