I could talk about eye contact and how using the road only works if we cooperate but, more than anything, I just find a heavily tinted windscreen to be antisocial. It's like the ultimate form of bullying. Driving around in a killing machine without your victims even being able to see you.

I like to stare right into the windshield where I think the driver's face must be, make them think I can see through the tint. I doubt it works.