Might seem persnickety, but criticism of mainland China can't be racism because Taiwanese are the same race and people aren't criticising them for this kind of thing (because they don't do it). It's really not even criticism of the Chinese people, who have no say in the matter either way and tend to be harshly punished for disagreeing.
In the end it's all just criticism of a specific government. Doesn't need to go further than that.
And the vast majority of Chinese people in China do support the government, for doing, among other things, bringing hundreds of millions out of poverty. The primary beneficiary of the Chinese government is the Chinese people there, and attacking the government is an indirect attack on the people there because The USA government, Australia, or any other non China government is not going to take after Chinese citizens.
Uh, do they? How do you know? The opinions of mainland Chinese about their government are completely worthless; they simply aren't allowed to disagree or learn about the world in a neutral manner.
For example, the Chinese government has not "lifted millions out of poverty", that's pure propaganda. Human society lifts itself out of poverty when not prevented from doing so by totalitarian governments. Japan was destroyed by war and became a rich first world nation within decades. South Korea became fully developed in also just a few decades. Plenty of other examples of that.
China is behind the rest of the world because of its government. If it weren't for the Great Leap Forward and then decades of economically devastating communism, China would be as developed as the USA or South Korea is by now. The fact that its people are still so poor can be laid squarely at the feet of its government.
But how many Chinese will think that? Probably not many. They are stuck in a system designed to mould them into loyal subjects from birth.
In the end it's all just criticism of a specific government. Doesn't need to go further than that.