Oh, Benny Lafitte? Yeah, that guy’s great. I love how the writers just *clenches fist* completely forgot about his story arc and the way he taught Dean that there is a grey area in hunting and that you don’t have to kill every monster.
Language does not always have to wear a tie and lace-up shoes. The object of fiction isn’t grammatical correctness but to make the reader welcome and then tell a story. To make him/her forget, whenever possible, that he/she is reading a story at all.