I think the thing people miss is that American friendliness is a bit fake, just not malicious. It's built on our pastoral history, but has evolved into a way to smooth down the sharp edges of a very competitive society - especially when that pastoral mindset ran headlong into the immigration that made contemporary America what it is.
Yeah, i totally get that, it's absolutely not malicious, i'm not sure it's even fake, maybe only a bit exagerated. But for an unaware person, it _feels_ that way, and i guess when American visit France or the netherlands, or, to go back to the subject, China, our reactions must feel weird.
That was jut to tell the author that i think he misread how Chineese are on this specific point. It wasn't a criticism of North Americans at all. Really, i think this is charming now (as long as we don't work together, then i will find this infuriating and bitch about it to my SO)
In a cowboy society where everyone is armed, it pays to be polite.
Most users on /r/AskAnAmerican don't seem to consider American friendliness fake:
https://old.reddit.com/r/AskAnAmerican/comments/ehe25w/why_a...
https://old.reddit.com/r/AskAnAmerican/comments/1k7sfbv/so_w...
https://old.reddit.com/r/AskAnAmerican/comments/1nq71lc/why_...