Geopolitically you're cherry picking from a time when nations of the EU are not as powerful globally. When Germany was powerful, look how they treated the Poles. When Belgium was powerful look at it treated the people of Central Africa (Congo). Spain, at the height of its power, treated the Aztec and other nations in the Caribbean with zero respect.
also because to be in EU it is a requirement to observe human rights. Disrespecting the rights of people even if they aren’t of your own nationality, is contrary to democratic values.
That is part of the diplomatic veneer. Yes, its an ideal, but it will be discarded when geopolitically necessary. How many boats of migrants have drowned off the coast of Italy or Greece? Are diplomats and citizens of Israel still allowed free movement in the EU with its treatment of those in Gaza?
Keep in mind, I'm not criticizing the EU. I recognize the really ugly realities that come with geopolitics and the choices that national leaders make to serve the interests of their citizens, even with it conflicts with their own ideals.
You may be thinking China and Russia are just as bad or maybe even worse, but that isn’t the pattern you should be looking at, you should compare with other democracies, and especially countries that have better democracy than USA.
Comparing "degrees of disrespect" is ignoring geopolitical realities. If you want to have a conversation about ideals humanity should adopt we will likely agree on most of the points of the discussion, but understand national leaders will (when push comes to shove) ignore all of it and do what they think is best for their nation no matter the cost to other nations.
Also, none of this is a defense of the actions of China, Russia, or the USA. Its a recognition that powerful nations do these things when it serves their interests.