Before you use this as an excuse to accuse the commenter you disagree with as being a Wumao, note that China's propaganda strategy serves to distract rather than directly engage, as they would rather minimize engagement. It's the same principle of "don't feed the trolls."
Here's a Harvard paper that covers this topic more in depth, though it's about domestic propaganda: https://gking.harvard.edu/files/gking/files/50c.pdf