Well, as a human being judging someone is just a become a part of our life. we judge each and every person who are part of our life and even who were not. Every time we saw someone doing something different we immediately starting judging them, and the worst thing is many times we judge people just because of their appearance.
We often judge a people when we don't know a person well, and also we don't have any proper information about a person or his/ her behavior. But judging someone could affect your respect level toward each other, somehow it could affect you about the value of person, you may lose a good relationship with them.
Why we should not judge other people: Lack of information: Are you sure that you were well known about all facts about the person? Most of time you have judged a situation without knowing a whole story. it is important to have a patience until you know all facts. It's clear and most important reason why one should not judge anyone. Every person is somehow different from another: Always remember all people have one thing in common that they are all different from each other. If one person don't like something. it doesn't mean that other people should not do it too. Before we judge someone always try to see positive side of her/him. try to put yourself in the situation from which respective person is going through. Look for basic goodness. This takes practice, as our minds naturally scan for the negative, but if we try, we can almost always find something good about another person.
When someone does something you don't like, perhaps think of it as they are solving same problem in another way than you would. Judging someone affects you more, than that person.When you judge someone, it says more about you and how you perceive the world. it clearly reflects the pre- conceptions you have in the mind. Instead of judging, someone and making an opinion about person, try to observe and be curious about them. many times we draw conclusions too quickly based on person's behavior in any particular situation.
Stop judging people and let them be who they are. Stop judging yourself and let yourself shine. Stop judging life and let it flow. Thank you! Have a beautiful life.