It’s absolutely not pure delusion. That’s absolutely hyperbole.
There’s no definitive metric for “who is the better country”, because the number of different methods of measuring that are on a similar order of magnitude as the number of crimes committed.
We could go back and forth all day, all week, all year, shouting ‘Tiananmen Square’ and ‘MKUltra’ at each other and prove absolutely nothing, and in the end we would just look like USA and China stans, which I’m not. In this case, China does not have any moral high ground from which to decry the US’s current imperialism, so they can fuck off. I’d be saying the same thing if a US senator complained about China’s genocide of the Uyghurs. They are no better and can fuck off with that.