I find this argument compelling:
“We have a physiological need for privacy. Mammals in particular respond poorly to surveillance. We consider it a threat because animals in the wild are tracked by predators, and it makes us feel like prey.”
Taken from this TEDx talk: https://youtu.be/jVeqAemtC6w Quoted bit starts at 5:45
Oh sure I’ll refill your iced tea more times than I can count for a dollar tip