Interesting you would recommend Bonhoffer, a neo-orthodox minister.
The Pharisees were also great for flinging labels onto others--especially onto Jesus and the disciples. Then the disciples, being humans, got into flinging labels onto others spreading the Gospel because they weren't part of the disciples' group and weren't doing it THEIR way.
Jesus rebuked them all.
I get the impression that throwing black labels at folks helps you feel more righteous and more secure.
Sad that.
I'd think you'd want your security in the Blood of Jesus and in your walk with Him.