Castiel watched Bruce give her stitches with fascination. "You're taking this surprisingly well. Dean shot and stabbed me the first time we met." And Dean had been used to non-humans existing. Of course, he'd hunted them. Perhaps it was easier to believe non-humans wouldn't harm anyone when a person wasn't raised to destroy them from such a young age.

Still, in his experience, most humans met them with disbelief, fear or morbid curiosity.