Hate is not commonly seen as a virtue, but it is. Proverbs 6:16-19 outlines six things God hates. Romans 12:9 tells us to abhor or "hate what is evil".
Hate actually helps us "cling to what is good" (v.9). Without the hating of evil and sin we diminish our ability to love. Love without a sharp contrast of what we need to hate just dulls the definition of love and our passion to love. To "let love be genuine" (v.9) we need to hate some things deeply.
I've been searching the scriptures and find that our love for righteousness can be stoked by hating anything that flys in the face of truth. Hate in the hands of people who don't know and trust God turns into self loathing or taking vengeance into our own hands. But hate turned over to God is a breeding ground for love.
Hate helps us deal a blow to sin in our own lives. Think about that sin that keeps creeping up on you. Instead of winking at it or dumbing it down - hate it. We don't like holding onto what we hate so give it a go. Hate helps and love conquers all!