The story starts totally boring - just an average dissatisfied family man with bratty kids and unhappy wife. Acts of random and shocking violence starts breaking out in the town. We're talking old ladies throwing down their walkers to try to kill somebody she never met. Soon enough it's an epidemic. Everyone is afraid of everyone even their loved ones. The ones affected see everyone else as threatening except those who are also affected. The government for whatever reason starts to pick people up and is putting them all in a big dark building when suddenly a battle breaks out and the protagonist ultimately becomes affected as well and has a sudden realization that the affected were right all along and he goes on to brutally murder anyone in his path. There is supposed to be a second book and I'd like to get my hands on it if it's out yet. I'm just terrible at remembering titles.

The title is Haters.