I'm not formally trained for ministry, I have no religious degrees, and I've never preached a message. But as a believer in Jesus, he's given me the command to share His gospel, so I'm going to put what He's given me out there, whether anyone accepts it or not.
Jesus did, indeed, tell people to stop their sinful behavior. But, that's not the first thing he did when he met with someone. He showed them love first.