I guess I am only capable of human emotions. I don't know how to hate without the nasty human side effects. Only God knows how to hate divinely.
To preach the message of the gospel is not just to preach hatred of sin or the repentence of sin, it is to preach the good news of grace and mercy. God's love is the most amazing love at all, because he LOVED us when he had every right to hate us--while we were still sinners. Yet somehow he found love for us. If he had merely hated our sin, he could have never loved us enough to die for us, he would have only seen us as slithering worms unworthy of any sign of love from him. Instead, he looked deep into and saw that we really didn't know how to keep his commandments, that we didn't even understand what his commandments are, that we had no possibility of living sinlessly, so he came into our world in the form of a human and lived sinlessly as only God could, and then died for us, not despite our sin, but because of it.
When you look into a sinner's eyes, you are looking into your own eyes. You are that sinner, but for the grace of God, you are saved from the eternal consequences of that sin. The only thing separating you from that sinner is Jesus. And if you, with love not hate, tell that sinner about Christ, then there won't even be that separation.
Let me tell you about a gay man I know. All his adult life he had been told, sometimes screamed at, that he is a sinner. He is not unaware that he is a sinner. You know what no Christian ever told him before--that God loves him and came to earth to die to pay for HIS own sin, every sin and that God died so they could have a relationship together. Not one Christian ever told him that Christ didn't come into the world to condemn him, but that he should, through faith, have eternal life. Not one Christian ever got to know him as a person, to everyone of them he was merely defined by his sin. Not one ever did anything kind or loving for him, because they said they loved him and hated his sin, but they, through their words and actions, showed they hated him as well as his sin. I was the first Christian he ever met that didn't condemn him, but introduce him to the idea that God died even for homosexuals. That man now goes to church, and maybe someday he will get saved, that would never happen if all the Christians he ever met only told him about God's wrath and never demonstrated God's love and grace to him.
So, go, hate! Identify with God's wrath and not his grace and mercy. But whatever you give out will come back to you and by whatever measure you judge, you will also be judged by God.
If you must hate sin, start with your own sin and get all the logs out of your own eyes before you start to obsess with the specks in the eyes of the sinners. When you have finally dealt with all of them, you will be free because you will finally fully understand the insane depths of God's capacity to forgive. Then you will find there is no more room in your heart to hate. All your heart will be filled with love.