You shouldn't make racist comments.
Bob is working in the office and wants to tell a joke to his new coworker Janie.
Bob wants to break the ice.
Bob's joke uses self depreciating humor that he thinks was pretty clever.
Bob's joke uses stereotypes that relate to black folks.
Janie likes Bob's sense of humor and the two of them bond.
Janie is deeply offended and reports Bob to human resources.