Well a problem with your argument is that assimilation is not only not unethical, but absolutely necessary for a functioning society. Imagine if you will for a second if our culture accepted racism and bigotry. It would be necessary to force assimilation on people to stop racism and bigotry. Oh wait, that's happening right now. We're literally forcing a culture of acceptance on a culture of racism and bigotry. Is that unethical? Should we stop? Perhaps we should have colored drinking fountains.

The problem you're having with China is:

1. The government is the one that's doing it, instead of naturally letting companies like Disney shove it down people's throats.

2. The assimilation is over reaching.

The biggest problem is #2. We don't know what the fuck that means. Should I be allowed to say the N word if there's no other racism or bigotry? If there's no racism and bigotry, is the N word even racist? Yet we enforce word usage today, just words that only have meaning because we give them meaning. yet it's quite over reaching to censor words no? Where's the line drawn?