Critical Support.

By all means criticise individual policies of China, be disappointed in political directions, even say that they've backslid into capitalist-roadism,

Just research stuff properly, preferably using sources inside China (you'd be surprised at the diversity of thought even inside Party publications, Xi gets a lot of flak.)

But overall, assume the CPC, whatever its flaws, is mostly comprised of comrades arguing in good faith. If you do that the entire tone of a critique changes from "China Bad" to, "This is how China can do better, and more importantly, illustrate some dangers and tactics we ourselves might consider in our own political actions"