Humiliating China in what way?

If this is a good faith question, I highly recommend looking into modern Chinese history, starting with the 1800s. Europe brought China to its knees. Massive EuroAmerican fortunes were amassed through getting 40% of Chinese people addicted to opium, Forbes among them. The Chinese attempt to protect their people by outlawing opium was met with orientalism by the merchants who convinced the British navy to attack China and force it to allow the drug trade. The Opium Wars is how Britain ended up occupying Hong Kong and how Europeans were immune to Chinese law in all the major port cities.

When the PLA joined with the KMT to fight off the Japanese, the KMT then turned on the PLA and massacred as many as they could. The PLA eventually won the hearts and minds of the Chinese people and through a people's war and through conversion of thousands of KMT soldiers to the PLA defeated the KMT who ran away to Taiwan. The British then stepped in and prevented the PLA from continuing to pursue the KMT because the British wanted the KMT to be their puppet regime. And that's how Taiwan got into the mess it's in.

The West spent a century dominating China, eventually even imposing tarrifs on behalf of China on goods that passsed through China, but all the tarrifs were collected by the Europeans! China finally stood up in 1949, but it has not finished pushing European influence out of its region. So the idea that the WHO should be trusted to be impartial when literally everything the West has done is weaponized against its enemies is laughable.

it's a thing and kind of rough

https://en.m.wikipedia.org/wiki/Century_of_humiliation

Common sense would dictate that we look into the cause of the pandemic. But I totally get the fear of the pointless propaganda war that would have probably come out of it.

It's beyond belief at this point how much the western press will bend any story about China into China bad.