Communists are quite critical of China and Russia, we just base those criticisms in reality instead of wild US imperial propaganda. What you’ve said is no different from when a right winger says “I was banned for a simple difference of opinion.” What’s the opinion? What’s the “criticism”? Because if it’s something absurd and offensive with no basis in fact, of course you’re going to get pushback. People whose ideology puts a premium on factual analysis and verification tend not to appreciate it when people whose ideology depends on maintaining a false sense of superiority by creating an ambient haze of vague scandal around all alternatives show up and start slinging bullshit around.