I wouldn't say there's anti-Chinese sentiments that is unwarranted.
China is actively stealing from advanced technology holding countries. Whataboutism is a common way to justify the behavior, which further inflmmates and even conjures up the good old sinophobia.
I think that much of what you read as anti-Chinese content is simply anything that describes a future without China as a hegemony.
China faces a huge risk of fragmenting like the USSR did, from which it would never fully recover.
but given the iron grip of the government and the military it is far more likely we will see China slip into a authoritarian state much like Putin's Russia or North Korea.
I think instead a far more likely candidate that could possibly challenge the US hegemony is a sort of EURO-ASIA partnership, where European countries would compete for highly educated workforces. Culture might be a barrier, but I feel that Japanese and Koreans work well with Europeans.
So it would be a China exclusive economic coalition that would pose a challenge to the US, if they do not move away from their current trajectory.
Russia will 100% fragment in the next 5 years, as they are literally on their last reserves and China is also not far off because their debt is staggering, not unlike the Japanese real estate bubble crisis.
Again my prediction is the US hegemony is unlikely to be challenged by a sole country superpower, but rather economically and technological coalition of outside countries that can pose a challenge (basically US vs the rest of the world which is even unlikely....as the US has port calls all over the world).
If China is to replace US, it needs to start building those nuclear carriers fast and well, something which is an impossibility at this current rate.