That's the point. The scale of China's reaction is obviously not because of the tweet itself but because of the trade war. The message is that the US have a lot to lose if China starts to also effectively blacklist American companies like the US try to do to Chinese companies... Edit: Someone should explain why now on HN a comment like this one that simply tries to look beyond the obvious and to discuss current issue…
Just take the article when China was first to ban the Boeing 737. Everyone here yell at bad china like in a tabloid forum...