[inimino]

For context for those who are not already aware, since this is being downvoted... white traditionally has the same associations in Chinese culture. So it was not an entirely unreasonable question. The answer is just that this happened in the US, not China, and wearing white in the US would be unusual.

[thaumasiotes]

But this is an event for Chinese migrants, not even American Chinese.

[CydeWeys]

It happened in the United States. And who says it was exclusively attended by Chinese Nationals?

[thaumasiotes]

The article.

[inimino]

This is a pressure tactic against Facebook. They are also carrying signs and chanting slogans. Of course the signs and slogans are in English; wouldn't do much good in Chinese. So it makes sense they would follow the custom of the country they are in and the company they are trying to pressure.