In a nutshell, yes we can critic or make a moral judgment of someone. However, make sure you also have the best interest of the other person. Otherwise, you could just be judging, which makes it a sin.
Matthew 7:1 is the most frequently quoted Bible verse today: “Do not judge so that you won’t be judged.” Theologist Paul Copan said, “It’s been twisted to mean we can’t say someone’s action or lifestyle is wrong.” However, when someone says, “Don’t judge,” he’s judging you for judging someone else. You’ve done wrong by saying someone else has done wrong.
Jesus made moral judgment too
Jesus too made moral judgments. He used “dogs” and “pigs” to describe certain people (Matthew 7:6). On the other hand, Jesus commanded, “Stop judging according to outward appearances; rather judge according to righteous judgment” (John 7:24). The thing is, Jesus is our ultimate judge. He alone knows the heart of men – we are not Jesus.
How do we resolve the apparent tension?
In Matthew 7:5, Jesus said to first examine ourselves (removing the log from our own eye), before helping (or criticizing) others. Therefore, if you are sure that the Holy Spirit is telling you to “rebuke” someone, the right kind of judging is doing it with a humble attitude, keeping in mind that like others, you too are a sinner.