The horror...
LOL I think most snake people can deal with a deli pic that gross, it happens. Looks to me like your snake just didn't eat, though. I'm not sure why the pinky fell apart like that though. Maybe it already had a slice in it from being packaged that you didn't see. The pic is a bit dark, but pinkies usually do start to turn black if you leave them overnight and they don't get eaten. I'd throw in garbage and try again in a few days.
Many babies won't eat if they are close to their shedding time. I would also ask the person you bought him from what and how they were feeding the snake.