The first principle of judgment is that we begin with ourselves. Jesus did not forbid us to judge others, for careful discrimination is essential in the Christian life. Christian love is not blind.
The person who believes all that he hears and accepts everyone who claims to be spiritual will experience confusion and great spiritual loss. God has blessed us with minds to think through and make wise judgments with His Word and Spirit.
But before we judge others, we must judge ourselves.
Matt. 7:2 'For in the same way you judge others, you will be judged, and with the measure you use, it will be measured to you.'