While much has been made (or more accurately, presumed) about the relationship that existed between quarterback Ben Roethlisberger and former Pittsburgh Steelers offensive coordinator Todd Haley, whatever failings that existed in their interpersonal dynamic pale in comparison to that which existed between Haley and the fan base of the team.
Of course, it’s pretty much always the case that the most hated person in any football franchise is its offensive coordinator. If you poll the fan base of most franchises, I would not be surprised if offensive playcalling is routinely cited as one of the biggest problems.