Different rules for different people is pretty much the definition of unfair.
Only among equals. There are different rules for employers and employees too. China is stronger than a decade ago but still far behind the US.
GDP per capita (2015 in USD) USA: $55,805, China: $7,990
Protecting a growing and still weak market is normal and proven to be a necessary step when growing an economy. There is no "equality" when you have "equal" access (which is anything but) between two highly unequal economies. The reason China seems so strong - with so much in the US marked "Made in China" - isn't because China is an advanced economy but because China is a huge country with a billion(!) more people than the US.