I dunno about far worse. CIA drug importation and the war on drugs, plutonium experiements on US servicemen, testing STDs in central america, Guantanamo Bay, supporting and arming Iraq vs Iran in the 1980s, the false WMDs precipitating the current Iraq war, enabling the vacuum to be filled with ISIS, the war against Afghanistan's Taliban when the 9/11 bombers were Saudis, the annexation of Diego Garcia, Vietnam and crimes against humanity with the defoliant use, the police state against African Americans, condoning Israeli settlements. I'm sure we can go on.
This does not absolve China, but they tend to keep their mistakes in-house. The US is particularly dangerous, has Imperial designs, and the most powerful nuclear arsenal in the world.
By any sane metric, the US is worse.