When criticizing someone even validly, one is accused of being 'judgemental'.

Answer

The 'judgemental' stupidity advanced to promote abstention from valid Shar'i criticism is a ploy of Iblees to close the avenue of Amr Bil Ma'roof Nahy Anil Munkar. In fact, being 'judgemental' is Waajib for upholding the Haqq and defending the Deen. Allah Ta'ala states in the Qur'aan Majeed:

"O People of Imaan! If a faasiq comes to you with any news, then verify it lest you harm people ignorantly, then you will regret what you have done." (Al-Hujuraat, Aayat 6)

In this Aayat, Allah Ta'ala explicitly instructs being judgemental. If the informed is a faasiq, his information/report should not be accepted without verification. The process of verification presupposes the fisq of the person, namely, that he is a faasiq. Such a presupposition is being judgemental. If the person is an aadil (pious/virtuous) then verification is not incumbent.

The testimony of a faasiq is not accepted for confirming even the sighting of the moon. Rejection of his testimony presupposes his fisq, and this is being judgemental. A determination has to made regarding his status. But this is the command of the Shariah.

Similarly, the Qaadhi has to be judgemental regarding the witnesses. If they are fussaaq, their testimony will be rejected. Thus, being judgemental is an order of the Shariah.

Rasulullah (Sallallahu alayhi wasallam) mentioned some signs of a munaafiq. If these signs are discernable in a person, it will be valid and permissible to label him a munaafiq in such scenarios where he constitutes a danger for the Imaan of others.