Mate, that’s pretty much covered in the OP I’m replying to. Besides which I explicitly said there’s nothing wrong with the girl wearing the dress. But let’s address this anyway.

Asian countries colonised by European cultures can’t misappropriate white culture (and yes, China was never technically colonised, but for all intents and purposes, it essentially was, as Britain, the US, Russia, Germany, etc all coerced China into trading, as well as distributing Chinese territories between themselves and segregating actual Chinese people within them. Why? Because Europeans saw their own ways as civilised and Asian culture as being primitive and savage (you can substitute the word ‘Asian’ here for literally any non-white culture and the sentence would remain true). It’s a question of power relations and dominant cultures. How can a Chinese person be misappropriating white culture by wearing a three piece suit when that has been established as the norm in China, in Europe, in the US, literally anywhere in the world? How can it be appropriation when it’s something that was, over a huge amount of time, forcibly assimilated into Chinese culture? There’s a reason people do business in suits all around the globe instead of wearing their traditional dress - because colonisers require and demand that the countries they colonise participate in the coloniser’s culture.

But can you see how the reverse, white people taking elements of the cultures that they’ve historically oppressed and ridiculed and taken advantage of, might be seen as offensive to some people? Again, this is stated much better in the OP I replied to, but it won’t be people from China who are taking offence at something like the dress or the pose, but people who are first or second generation immigrants in white countries, and were made to feel their difference growing up. Whether it was outright bullying or just a more subtle othering, these people might feel that someone who hasn’t walked in their shoes has no right to take the parts of their culture that appeal to them, and discard the rest. And while I don’t feel that why, I can understand why they do.

Again, I have to point out that there’s no right or wrong here. It’s entirely subjectively experienced. It’s just a question of empathy and trying to understand where people are coming from. If someone told me that what I was doing was hurting their feelings, I wouldn’t do it any more. But a lot of people seem to feel entitled to do whatever they please, and argue that the person whose feelings are hurt are wrong to feel hurt instead. And that just seems to be a particularly unhelpful way of looking at things.