"Judge not, that you be not judged. For with what judgment you judge, you will be judged; and with the measure you use, it will be measured back to you. – Matthew 7.1-2
If I could think of one verse that people who don’t know or care about the Bible would know this would probably be it. If you get into a discussion about nearly any sinful activity the person will say something ‘even your Bible says ‘judge not lest you be judged’ so you better not judge me.’
‘Judge not’ is not an excuse to cover up or hide sin. It does not mean that Christians should never speak out against sin or point out sin.
The problem here is one of attitude. The kind of character described here is the guy who comes up and tries to judge someone’s sin while not taking the time to deal with their own sin.
It is easy to judge and condemn others with our attitudes. I wonder if we would like to have every aspect of our lives judged by the same standard.