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You seem to not have come across this so I'll spell it out.

Authoritarian China controls both the education, media and internet. It can and does fan the flames of ethnonationalism for political purposes.

The propaganda is usually reasonable sounding, but actually incorrect reading of history.

The more nationalist individuals make their own decisions and are encouraged to be themselves propagandists. Especially spreading propaganda towards other ethnically Chinese people but also to the wider world.

The infectiousness and effectiveness of this propaganda is actually quite fascinating to observe.

Everywhere on the internet there are examples of this information warfare.