Love your neighbor as yourself.
Love your enemies, do good to those who hate you.
It’s natural to love people who love you. (It’s not always easy, but there is still a natural tendency to reciprocate love.) Unfortunately, because of the sin nature we inherited from Adam, it’s also natural to reciprocate hate. However, God’s plan is different. God knows that we’ll be happier in the long run if we love everyone, even those who are mean, hateful, abusive, or indifferent. Everyone you encounter is someone who you should love.