Under One-China policy there is just one China which consist both of Mainland and Taiwan. Thus affairs inside these areas are internal affairs.

That policy is a nice PR name for the intention to take foreign territories, but it's not something anyone else has to respect. They can say One-China means the whole world belongs to them if they like, that still doesn't give their claims any more weight.

You may want to brush up on your international recognition history. Officially, for the UN and literally all countries bar a few microstates, Taiwan is a province of China. The fact that they are, for (almost) all intents and purposes an independent separate country isn't recognised by anyone officially, and that probably won't change unless a regime change happens in China.

Sure, because "literally all countries" made themselves dependent on China economically and so are more or less forced to go along with it. But I personally am not.

No, this dates to the 1970s when China was an underdeveloped country with a mainly agrarian economy, and it was just accepting the facts from the late 1940s when the Chinese Civil war ended with the RoC running away to Taiwan (up until the 1970s most countries recognised RoC as the China, even though it controlled only Taiwan - now it's the opposite, the PRC is recognised as the China, even though it doesn't control Taiwan).

Oh, I wasn't aware of that. Though it often doesn't seem that clear-cut when e.g. the WHO ignores question even mentioning Taiwan or companies apologize for stupidly minor details - things like that don't make the chinese government look very confident in their status.

The WHO doesn't have much choice because, again, Taiwan officially doesn't exist, and it would be scandalous for a UN agency such as the WHO to recognise them by mentioning them.

> it would be scandalous

I can't think of a democratic, free country where the government started flipping tables because one TV station on the other end of the world showed the wrong version of a map. At worst the citizen of that country would make jokes and memes about it for a week.

The WHO didn't have to mention Taiwan...they pretended they didn't even hear a question mentioning Taiwan. That's self-censorship beyond reason.

> I can't think of a democratic, free country where the government started flipping tables because one TV station on the other end of the world showed the wrong version of a map

You think Ukraine would enjoy a map showing Crimea as a part of Russia? Poland with Danzig/Gdansk as German? France with Alsace-Lorraine as German? India with Kashmir Pakistani? Argentina with the Falklands as British and vice versa? Etc. Many countries' citizens and governments would be rightfully agitated by maps hitting open or old wounds, and depending on the country and desperation of the government it could escalate to table flipping as well.

> The WHO didn't have to mention Taiwan...they pretended they didn't even hear a question mentioning Taiwan. That's self-censorship beyond reason

If they did respond to the question, they would be talking about information provided by Taiwan's government, implicitly recognising it as an independent authority.