Part and parcel

Imagine spending parts of your life being concerned for how other people live; being frustrated by them and wanting harm to befall them. It's sad and pathetic and yet millions of people in this world are like this. 

People who haven't caused them any direct harm are made victims to their vitriol. 

The basic psychology is not that complicated. They have deep seated frustrations about their own lives and need someone to blame. They will excuse their behaviour under the guise that these people are part of the cause of their own failures. Instead of examining their own psychology they choose a caustic shortcut.

Since this is a fundamental human flaw it will always exist and form part of the way society functions. The smaller and easier the target, the more convenient.

It's in the coding.