I have a strong, and certainly not uncommon, desire for my child to be validated by the love of other people. Most parents want their son or daughter to be a lovable person, and it’s that desire that makes John 15:19 so important and so transformative when it comes to the way we prepare our children for the future. Christ tells His disciples, “If you were of the world, the world would love you as its own; but because you are not of the world, but I chose you out of the world, therefore the world hates you.” It’s not just John 15:19, either. There are many Scriptures that describe the adversarial relationship that God’s followers will have with those who are not believers.
Reading this, I realized that if God answers my prayer for my son to be a follower of Christ, people will hate him. People will absolutely, unquestionably be repulsed by my son.
Go read the full thing, it's well worth your time.