This is one of the most common charges brought against us who preach in the open-air is that we are judgmental.  And on the surface, this objection seems plausible.  Yet it is contradictory as the objection itself is a judgment!
Friend, calling sin “sin” is not judging, rather stating a fact.  The most loving thing a Christian can do is to warn those who are headed for eternal tragedy that they are in danger. True love warns!
Most often the one objecting to open-air preaching cites Matthew 7:1.  In fact, you can find a person who has never read the Bible and start out Matthew 7:1 and they will finish it.  Friend, this was Christ rebuking the Pharisees.  Yet we see Jesus instruct us to judge in His own words!
“Do not judge by appearances, but judge with right judgment.” – John 7:24
Our goal is not to pronounce judgment on anyone as if we are “Holy Ghost, Jr.”  And we don’t have to.  God’s word says that if you don’t have a saving relationship with Jesus Christ, you’re condemned already! (John 3:18)