You tell a raunchy joke to your coworker. she becomes offended and files a complaint with her supervisor. where did you go wrong?

Not everyone's taste in humor is the same. Its best to try and gauge a person's particular sense of humor before telling jokes which could be seen as offensive. Asking directly about someone's sense of humor can be one of many ways to try and do this. Overall, its also best to avoid jokes that could be easily seen as offensive in a professional setting.