Comment by Scienz

This is just a guess, but I would suspect it's the fans. I remember seeing actual riots at my former school over a football (the American variety) game - the cars flipped, fires started, campus-police-in-full-riot-gear-firing-tear-gas kind. The fans probably just associate it as some brainiac professor declaring war on their culture and insulting their beloved players, and respond with hatemail and death threats.