I agree with those who say that we are all judgmental. That is simply human nature. Having said that, however, it does not follow that we should always ACT on our judgments.
If you see someone doing something that has no effect on you whatsoever, it is not always a good idea to be judgmental about it. Why should you? Live and let live. On the other hand, if you belong to a group and someone in the group is constantly acting like a jerk and disrupting things, then some judgmental action is probably indicated - because what they are doing hurts you, either directly or indirectly.
Wasting time being judgmental about things that do not affect you, only diminishes yourself as a human. Being judgmental implies negative feelings. Who needs negative feelings? Smell the flowers. Save your judgments for those who really deserve them.