I don't handle chicks a lot at a young age, I spend time around the brooder so they are used to be being around, but I don't handle them. Most chickens go through a "teenage" stage where they avoid all human contact no matter how much time you previously spent with them. I've found that since they've known me their whole lives, they start to warm up to me once they reach about 5 months. Much easier then trying to force them to like you.