I used to live in the US and live in Germany now, and boy do i often miss the people who were at worst pretending to be friendly and who would offer to help. Here people often make you feel like you're interrupting them, and that they are doing
you a favor by letting you shop there, and it can be very hard to find someone who's available to help you.. So yes, I could do with some of that US customer service. However, I have to admit that when my husband and I go back to the US, especially the particular area we go to where these people are extra friendly, we just wanna be like, "leave me alone, will you?" It feels a bit too much. I guess a balance would be nice. Those of you who are really bothered by this stuff may want to stay away from China. You will be really annoyed by the shop owners. Japan is also a bit over the top, but they're nowhere nearly as aggressive.
Now, I have to say that I have worked in customer service, and that when I wished people a nice day or the like, I really meant it. Same when I was friendly with them. I really did want to be as helpful as possible, with a few exceptions. And it wasn't uncommon that when I asked people if they needed help, that they hadn't thought that they did, and only realized it when I asked, so it wasn't so bad. What was bad was when we weren't all keeping track of who had already been approached, and you would get the exasperated person who would be like, "You people have asked me four times already!" Also, maybe there should be a sign at the store that you could pickup when you enter that says "just browsing, thanks."
But yeah, overall I would agree with the people who say to just respond politely with as little as possible. Most of these people make crap, so have some mercy on them