I did a small experiment by keeping track for a day of the judgements I make about people and things. A simple example is noticing a person smoking. As a non-smoker, I have a number of stereotypical judgements that pop to mind none of which had anything to do with me me since the person was observed at a distance.
Because I was conscious of having such judgemental thoughts and comments, the number of incidences was undoubtedly fewer than had I not been watching myself. I am sure that I missed noticing some as well.
What I learned from the experiment is that judgement gets in the way of enjoyment of life. If I make a judgement that I don't like a particular style of architecture, for example, I have automatically prevented any opportunity to discover something different.
When I remember to be non-judgemental, I am more open to new experiences. [Russell]