A Christian who uses the same methods as the world is not much hope for a good impression on those he is trying to win over to Christ. A joyless Christian is no better. Christ followers should give the world something to envy, not something they desperately want to dismiss.
Enough people will do that on their own without our help. There is a time to call out sin, but we must be careful to not go around with angry faces and the same old hammer, pounding on closed doors. Some people will reject the gospel, the greatest gift a man can have, to their loss. We should not be angry at them but feel sorry for them.