In terms of mainland China, the Chinese government is using nationalism as a tool to rule the Chinese people. The Hong Kong people became a target for the Chinese people to point the finger at, and that's the reason why there is propaganda in China. What it was doing was a good job and framing Hong Kong as an opponent to the Chinese people. Nationalism is not only harming the Hong Kong-China relationship, but also the international relationship, because every single one who points the finger at China is accused by China as the opponents or the enemy of the Chinese people. That's related to Canadians and other people around the world.
On May 5th, 2015. See this statement in context.