Sins keep people, those people we see and talk to every day, separated from God, in direct line of His wrath, and at risk of damnation forever if they don’t repent. Some of them, in God’s mercy and providence, may be your brethren not yet revealed. And when they are reborn and come to Christ, they will need discipleship and, very likely, encouragement and help in their struggles against the most addictive of these sins. They won’t need jokes that trivialize their sin. Sin is not funny business. Theirs nor yours nor anyone’s.