You have HK protesters waving American and British flags. These are the countries that have started wars all over, in the last 70 years since the end of WWII, ostensibly to promote democracy, and everywhere this happens there is chaos and destruction.
Add to that, China's cultural history of being invaded and exploited by various foreigners whenever it was weak or divided, and what happened to Russia in the 90s after democracy and neo-liberal capitalism were introduced, and you don't really have a good story here.
So, imagine then, you are in China, and the HK protestors sound like they want what for China?
The popular notion is that China would become a place friendly to Western ideals if it became successful. But even here, the West – and in particular, the US/UK – doesn't "get" China. Whatever is said here, China will bypass the US/UK, for practical purposes. But in any case, it is not as if they are representative of the West as a whole, nor can they claim to have a better human rights record – or equality record – or a fairer society.