Social Media itches the worse impulses humans have; to blindly comment in contradiction what another has said without fail.

Someone posts it's a lovely day with clear blue skies, someone will reply you haven't taken stock of the 2 clouds they saw. You say Joe's bar makes terrible burgers, someone has to reply they make amazing burgers.

The compulsion to shut the hell up is turned off on the internet where in the real world you'd reign yourself in.

Probably because you know you'd get smacked.