This is to be expected. A divorce stirs up all sorts of family feuds, on both sides. Old grudges that had been papered over come out of the woodwork.

And Imperial ambitions die hard. The US will be next as it unaccountably picks fights with the nation that it has surrendered it's economy to.  Just this morning I got an Email from the (US) Naval Institute comparing the US-China situation to the US-Japan situation pre-WW II and calling for a Naval buildup.  Dreams of old glory die hard.

Unlike many (most?) progressives I am not pro-China. But a recent show of indignation by the US government about China tracking an American nuclear sub passing through the Taiwan Strait got me shaking my head.  
I looked up the distances. Taiwan is one hundred miles from the mainland. Cuba is 90 miles from Florida. What would the US say if China ran Nuclear submarines between Florida and Cuba into the Gulf of Mexico? International waters - but...