There's a whole wikipedia article discussing how it is both a logical fallacy and how it is often used as a tool of propaganda.

https://en.wikipedia.org/wiki/Whataboutism

Please don't engage in whataboutism. One should be able to criticize China's actions without calling into discussion actions of other nations.

Do you go about threads criticizing US govt actions drawing parallels to similar actions in other regimes like China or Russia?