How are you going to cancel someone if they already aren't listening to you? Gunna place thousands of calls to their employer? Mail them awful things in the mail? Un follow them? I know you were joking but come on. There's no way to cancel something external. In order to cancel them, they need to buy into your system and have shame, something the CCP does not have.
The same way any cancellation works: refuse to buy stuff made in China. Boycott Amazon until it stops selling Chinese stuff. Don't watch Chinese movies. And so on.
The subject of the cancellation doesn't have to use Twitter. The consumers should - which is perfectly the case here.
How comes it's not cancelled by the Twitter mob yet?