Judging others has good and bad sides. When you make choices based on observing and evaluating other people you are using an important skill. When you judge people from a negative perspective, you are doing it to make yourself feel better and as a result the judgement is likely to be harmful to both of you.

Why you should never judge someone?

Lack of information: Are you sure that you know all facts about the person? Most of the time you have judged a situation without knowing the whole story. It is very important to hold off until you know all facts. It's one of the most clear reasons why we shouldn't judge other people.

Why is it important to not be Judgemental?

By staying non-judgemental, they are more likely to feel comfortable about discussing their issues and to continue the conversation. They are also more likely to come back to you again when they are struggling, which means you have more opportunities to be able to help them.