There is little plausibility to the claim that it is absurd to criticize anyone for being critical  Obviously, people must assess one another and not all assessments will be positive  However, there is wisdom behind the injunction against being judgmental
To be judgmental is not merely to assess someone negatively, but to do so prior to a serious effort at understanding
There is some plausibility to the claim that it is absurd to criticize anyone for being critical.