It can be perfectly rational since extending the same distaste towards the US government allows you to see that any of those things you listed is worse by orders of magnitude in China. To pretend otherwise is just whitewashing China.
Claiming that every criticism is tantamount to racism is what's distracting from discussing actual problems.
The function of the administration’s demonization of China (it’s Sinophobia) is to 1) distract us from what our rulers have been doing to us domestically and 2) to inspire support for poorly thought out belligerence (war being a core tenet of our foreign policy).
I see your point, but disagree with it.
Having solidarity with the Chinese people is unrelated to criticizing their government. Bringing up sinophobia whenever criticism towards China is brought up, when the context is clearly the government and not its people, is distracting from discussing the problem itself.
The idea that one should first criticize their own government before another is the whataboutism.
Also, you're making some strong and unfounded claims about the motivations of the US government in this case. I'm an impartial observer with a distaste of both governments, but how do you distinguish "sinophobia" from genuine matters of national security? China is a political adversary of the US, so naturally we can expect propaganda from both sides, but considering the claims from your government as purely racism and propaganda seems like a dangerous mentality to have.
America doesn’t have rulers. It has democratically elected politicians. China doesn’t have democracy, however.
> if we were to have sincere solidarity with Chinese people against the international ruling class
There is also no “international ruling class”. In part because there are no international rulers. Speak in more specifics if you want to stick to this claim.
> Concentration camps, genocide, suppressing free speech, suspending due process
I’m not sure what country you are talking about, but America definitely doesn’t fit any of these things that you claim. Obviously there is no free speech in China. And obviously there is no due process if the government can disappear people like Jack Ma for years or punish free expression through social credit scores. And for examples of literal concentration camps or genocide, you can look at Xinjiang or Tibet.