My boss recently created and went over our hr manual (were kinda a startup) and in the manual he wrote than listening to country is a firable offense. We all thought it was an inside joke…. well fast forward 2 weeks and one of my coworkers was listening to country music in his office ( some of us have separate offices away from the cubicles) and my boss walks in shuts the door and they proceed to have a very heated conversation. After thexconversation my coworkers packed up his stuff and walked out. I found out later he was fired for listening to country music??? Is this legal?? Should we be concerned???