speaking somewhat loosely, actually there is no "much as if" in this sense. The Chinese have a "face saving is the most important thing" culture, and the US does not. Think of it more like the tribal regions of the -stans: China is metaphorically ready to do some honor killing over this in a way we can't grok. Doesn't mean we should acquiesce of course. I'd perhaps make the analogy that everybody in the Chinese government is as thin skinned as Trump. (I'm exaggerating to make analogies here, no need to jump all over me, of course it's more nuanced.) Meanwhile, our neighboring Mexican politicians publically pour scorn on the US all the time and it doesn't particularly affect our relations (not sure if Trump can take it tho)
https://en.wikipedia.org/wiki/Face_(sociological_concept)
In any case, it would not actually bother the US all that much if China talked to Hawaii, nor does it bother US that China talks to the Philippines; it would be to our benefit if China and the Philippines resolved their differences mutually, and the same with Taiwan; it does bother US that the Philippines would make short-sighted unwise bargains inasmuch as we get the sense that we will be involved in cleaning up the mess later, and inasmuch as it reinforces China's belief that they should throw their weight around more WRT the Biển Đông (the East Sea, off the coast of Vietnam;)