Because it refuses to acknowledge the sovereignty of Taiwan, it sent troops to enforce violence against what was originally peaceful protestors in Hong Kong, it is forcefully imprisoning Uighur Muslims in concentration camps, it is forcing citizens to install spyware on their phones, it doesn't have rule of law, it arbitrarily locks up human rights activists and lawyers, it will target people for their religion, etc.

Note that these complaints of mine are against the Party, not the people of China as a whole. Xi Jinping and his cronies are a fresh brand of evil.