The Lord is gracious and compassionate, slow to anger and rich in love. The Lord is good to all; he has compassion on all he has made. ~Psalm 145: 8-9
There are some really hard to love people out there. Being a Christian doesn't automatically make it easier for us to deal with them either. It takes discipline and self-control to see people the way God sees them - and ourselves.
Thankfully, God does give grace to all. He's generous with love, and has compassion for his entire creation.
Each day, move one inch closer to God by showing a little grace, compassion, and love to those people in your life who are hard to love. Pray for them to receive God's love, grace, and compassion.
Then ask God to reveal those "unlovable" parts in yourself, and the courage to tear down some of those walls.