While it is human nature, it does a couple of things to the negative for the people involved and society as a whole. First off, let’s all agree that we are all flawed. We all have things that are not great or that others would view as being less than stellar.
When someone judges another, the judger assumes the moral high ground allowing arrogance to rule the day. So right there we can figure out something about the judger that they are not seeing in themselves.
When someone is judged, they often get defensive. So we can see that the judging causes a rift between people…it is divisive. And now we have a defensive person or group of people. They are likely going to lash out at those doing the judging. So we can add confrontation and aggression to the mix of things brought on by judging others.
Our society has some judgements built into it, things that are generally considered acceptable or not. They are called our societal norms or our ethos. For example, torturing small animals is generally not considered an acceptable behavior. There are many others, this is just an example. Most of these things are identified in laws as being not allowed by our society. So I don’t consider it “judging others” to consider to say they are doing wrong or there is something off about the person doing these things.
Now we come to the part where judging others isn’t as clear cut. When those judging assume a “wrong” by someone else and judges that person on that assumption. Example: I have been accused of being a racist and a xenophobe because I have stated I don’t like illegal immigration but support legal immigration. Typically that judgement is based on some belief that when I say I don’t like illegal immigration that is the truth but when I say I support legal immigration, that is a lie. By judging me as a racist or a xenophobe for that view point is nothing but pure ignorance. It tells me much about those that have made those statements.