When their kink is non-consensual, or otherwise with unwilling and unwitting participants, that’s when you know it’s not “just a kink” and they’re actually just a bad person.

Edit: CNC is “consensual” if done legitimately, in case anyone thought this was kink-shaming. My take is, everybody over the age of consent should be free to do what they want with their own bodies, including consenting to things other people don’t like.