Oicur, when I worked at another (South) Asian carrier (not my most recent), I would just start snapping pictures when something like that happened. The situation usually got rectified pretty quickly. In this case the video will do some good, at least temporarily. OP would do well to avoid China for awhile, though.

Oh, yeah. Well done.

As for confronting the crew ... the folly and danger of doing such a thing in totalitarian China has already been mentioned. Note also that the English skill of many Chinese pilots is atrocious, at least among those flying domestic routes . They likely wouldn't have understood you.