That is humanity. People are narcissistic assholes. If the average person wasn't scared of what would happen or how they're perceived they'd punch you right in the face for looking in their direction.
That's what internet anonymity does. Brings out people's true essence. You see it with road rage too. The protection of the vehicle and the quick flight make giving the finger in response to a reasonable mishap an easy answer. A "FUCK YOU" for accidentally veering into your lane. Sound reasonable?
Yeah there's a few Mother Teresas out there, but most of them are self righteous a-holes too. What a world.