Why is Russia exempt from Chinese rage against the "century of humiliation," and instead directs the rage at the US, which was not involved in dissecting China?
The Century of Humiliation narrative does not necessarily exclusively target the US. The present situation is not a "rage" against the US, as well. China is not a country arrested in the past but a bloody rational one, and, all signs indicate that, at present, the largest geopolitical (I would even say, existential) threat to China comes from the US government. But Chinese response is not a senseless, mass rage, rather, all China does does is to try to handle a well-programmed (with a lot of missteps and trials and errors, for sure) nation-building and strength-amassing strategy. Certainly, by simply growing, China disturbs the status quo. Hence the reason why the US government and its people feel like China does threaten the US. China does not; nature of things does.
On the other hand, it would be the naiveté of century if one would agree that US is benign, or even slightly friendly to China -- especially ever since the US government felt it was released from the Middle Eastern nightmare. The window of opportunity for sustainable great power relationship is closed, I believe. China has firmly partnered with Russia, obviously.
The hostility the US shows to China ranges from technology and economy to politics, sociology and culture. There is a frontal attack from the US with its civil, political and military society taking part in a fanaticism reminiscent of Middle Age's religious cults. The only reason your teeth do not penetrate deep is because China's skin is getting harder and firmer day by day. Believe me, even if you personally may hold a positive view of China, you will still not want to see the day China overtakes the US and changes the order of things, that is, your way of life. Because, sustaining your way of life requires that China not be No. 1 economic, cultural, and military power.
So, we should not mistake one thing for another: Due to globalization, there will certainly be more people-to-people exchanges; but these are often unrelated, unimportant lot (unless they are not undercover agents like the white guys we often sight at anti-China protests in Taiwan). Our respective governments will continue a cut-throat cold war that might even develop into proxy wars (although I do not expect direct confrontation -- not because you do not want, but because you cannot).
Greater interconnectedness, in fact, gives you, being the stronger party, additional leverage to play against China through a myriad of measures like academic anti-China-ism, social media manipulations, cyber attacks, sending agents as tourists to stir discontent inside China in the hope of a second Tienanmen, creating an academic discourse of China-threat, using your influence to stir anti-China sentiment in Taiwan (US AIT in Taiwan is actively working to alienate Taiwan from China), Japan etc., putting smaller nations against China etc. etc.
Yes, we are each other's business partners, but, I guess there is not much feeling of civilizational, cultural affinity similar to that which you share with, say, Europe. We will never take part a partnership under an institution like NATO. That's the truth.
Adversity and rivalry are fine for China. So long as you keep your cool, I guess, China can keep its. The historical struggle continues and no need to feign innocence or ignorance of what exists.