Everyone else seems to have covered the basics... But what's missing is The Suez Crisis.
France and Britain, the two preeminent colonial powers in Europe thought that they could use Israel to pressure Egypt into returning the Suez Canal to them (which Egypt had nationalised following Britain, France, and the USA reneging on their obligation to help build the Anwar Dam).
France and Britain coordinated with Israel for an Israeli invasion of Egypt, and then France and Britain would step in "as peacekeepers" and control the Seuz as a demilitarised zone. However, the US was having none of it, and went behind France and Britain's back to undermine them and coordinated with Israel and showed to the world it was a British and French plot, humiliating the two nations, cementing the US as Israel's main backer, and destroying what good will remained for France and Britain in the Middle East.
For the formerly top dogs of Europe, it was a rude awakening which showed them that the pre-Second World War order was truly gone and they could no longer make big geopolitical decisions without the US.
Yes, obviously is it. The PRC has done, and continues to do, bad things. The racist imperialism in Xinjiang, Inner Mongolia, Tibet, as well as Guizhou, Yunnan, and Guangxi is bad and should be denounced.
Now, what's your actual point?
The actions of the PRC do not excuse, and are less genocidal than what is Israel is doing with US support in Palestine, or the attacks on indigenous people in South America and India, taking place due to capitalist expansion (Or indeed the killings and destruction brought about by capitalist expansion of the PRC in Myanmar and Laos).
Hell, if the state of the US keeps up the way LGBT people are treated in the US will become more genocidal than the PRC's treatment of ethnic minorities. The way the US has treated American Indians may not be quite as culturally corrosive right now, but that's because the destroy their culture and get rid of the intellectual who speak out part has thankfully, grown less severe over the last 80 years (in part because it had been felt a success by those who wanted to force Indians to integrate and assimilate (read: sinicise (read: be culturally destroyed)).