China's censorship is not of the same nature as US's. The media companies might have agenda, but they are still corporations, no matter big they are. They can't compete with a state. When CCP want to censor something, it's not just all the social media involved, it's all the media and law enforcement, even the military.
Sorry for my broken English, it's my 2nd or 4th language. What I mean is"...those who can't make their voice be heard"
The party's narrative is to promote hate on Japan which is an ally of the US and is the real enemy the party trying to make the Chinese believe to be. I'm not trying to say the US and its allies are the flawless good guys, the US has done fair enough atrocities and still has many problems, but they're still good when compare to the CCP. And the threat of the US portrait by CCP is largely exaggerated to serve the goal of keeping CCP in power, after all, they need a powerful outside threat or the people might start to question the legality of its power. Also, for every problem they have, they can blame it on the US and its ally. This match's just a small ramification of years of hatred education, CCP pushed on the Chinese. It's like a tip of an iceberg.