This phenomenon appears to be unique to situations where the accused party is Chinese. No other nationality/ethnicity seem to suffer the same treatment on HN and elsewhere on the Internet.Actually, it gets applied to all Asians. I know this firsthand as an Asian. It used to be applied to the Japanese with just as much fervor, especially in the 80's. (I lived through this.) I should think it was applied to the Americans in the early days of the US. I suspect it was applied to Germans and Russians when they were consolidating and industrializing those nation states.
Here's where bigotry comes in, in the 2019 style: When white people do it, it's "appropriation." When Asian people do it, it's because they have no creativity and can only imitate. In truth, it's all cultural appropriation, and cultural appropriation is actually an engine of human progress and creativity.
The charge of copying gets levied as a protectionist tactic by those already of generally higher status. The charge of appropriation gets gets levied as an aggressive tactic by those who desire that status for themselves. Either way, it's a waste of time better spent learning, growing, and changing.
Appropriation is good. It's how progress is made!