This might come as a shock to you but those at the highest levels of the US executive branch don't care about the government type of any country, never mind China.

The US has lent considerable strategic support to dictatorships and democracies alike. The moral nature of a country's current regime has never been a factor in real US strategy; it's only been used as convenient frame for rhetoric.

The US cares about China now because China is a competing power economically and strategically. And also the US always needs an enemy to justify its abnormally enlarged military.