I did not notice anything in China either (and been there a lot for work) as I don't notice anything in the US. Actually; things like borderpatrol and policing (and the treatment you get from these two gov agencies) seem far worse in the US than in China if you did nothing wrong. But we know the reality ofcourse; just saying that appearance/visiting does not tell you a lot.
As someone who has been in Saudi Arabia, China and the US, I can say that your view of reality is severely incorrect. I encourage you to visit the US before making this kind of statement. (Disclaimer: I'm European)