Taiwan is de facto a separate nation. They exist as a separate entity, whether China likes it or not. And some of us refuse to deny reality just because China wants us to.
It's more complicated than that, of course. Taiwan is de facto a separate nation, but both Taiwan and the mainland agree that they are one China. They just disagree about which government is the legitimate ruler of that one China. One suspects that the CCP would not be pleased if we replied that, yes, China is an inalienable part of the territory ruled by the government of Taiwan, even though we would be (technically) agreeing with them about one China.
What is interesting here is that in international relations and territorial claims Taiwan is really only different from the mainland in that they haven't the power to go after the claims that both sides of the straight essentially have and are too weak to be assertive and displease other countries.
Taiwan stays mostly quiet about the territorial issues with India because they want to play India against the mainland, as is plain in this tweet, although they have the same understanding as mainland China.
I can see "we love you Taiwan" replies from India... Maybe so now if if they were in power in Beijing you wouldn't.
Taiwan is de facto a separate nation. They exist as a separate entity, whether China likes it or not. And some of us refuse to deny reality just because China wants us to.
It's more complicated than that, of course. Taiwan is de facto a separate nation, but both Taiwan and the mainland agree that they are one China. They just disagree about which government is the legitimate ruler of that one China. One suspects that the CCP would not be pleased if we replied that, yes, China is an inalienable part of the territory ruled by the government of Taiwan, even though we would be (technically) agreeing with them about one China.