If I remember correctly, it was a bunch of baloney. I do agree with listening to the horse, but letting a horse do whatever he/she wants because the horse is your friend is a good and fast way to put yourself in a hospital.
Don't get me wrong, I have "friendships" with the horses I work with. But the difference is I respect the horses as I need them to respect me. If a horse thinks he can walk all over you, you will get hurt. And that is the exact mindset "friendship training" puts a horse in.