Well I think everyone can be judgemental and it is very normal to judge others. The first impression we get of others is a very important step in our way to build our picture of each other.
If for instance we see a blond woman who shows a little too much, we are thinking her as stupid (when I say we I mean the majority).
If you try to look in a street, you will see that we often walk in groups. It is very rare you wil see punkers going with young businessmen in suits. They are completely different people and belong to different groups If we see something that does not belong to our group, we tend to be affraid. It is the same with racism. It is something that happends in the primitive part of the brain but it is very hard to change these actions.
If an older man lets say 65 is walking arround in the city with a 30 year old woman. They are kissing and holding their arms arround each other. What would most people think? Most people would think that the woman is with him for money and if the man is not well dressed, they will probably also think that he hits her. And people will have these opions quickly after they see them, even though they have never talked to them, they dont know their name or anything but even though most people would think this way. In Denmark for instance, if you are convicted of something like violence, then you will probably get a lower sentence if you wear a suit, because then you will signalize trust and a person in a suit who signalize trust and that he has a good control on his life, he will get a lower sentence. It is sad but it is the truth.
I think it is impossible to get rid of judgemental people as it is such a big part of how we human function.