As someone who's lived in China I get the part of the Chinese only protesting when they're "really angry". Chinese are generally quiet and non-confrontational when dealing with non-Asian ethnic groups.  I've heard some Chinese say that when Chinese confront other Chinese or Asians they are fierce, but when confronted with non-Asian groups they cower and hide. This is why this story is somewhat unusual, in good way. Glad they're making themselves heard.