The material that has been carried over from the BBC version of The Office has become increasingly less over the years. Yet, there remains some storyline that has still not been covered in the American version.
Michael has a history of being the polar opposite to every person that has managed him. In the case of Jo, she finds Michael's lackadaisical and unprofessional behaviours to be inappropriate, and counterproductive. As Jo has set the example of working hard and doing overtime, Michael has little reason to not mirror her work ethic.