I've noticed in every group I am involved with through work or socially there is usually a person that people love to hate. Often others seem almost to bond through a shared dislike. One person may initially have a grievance but it seems that others will quickly jump on the bandwagon. Similarly there is often a person mutually revered. Often neither the figure of hate or worshipped person deserve this reaction or their reputation.
I read something that said society needs a hero and a villain and simply can't operate otherwise.