I don't understand people who keep their cameras on during a lecture

Showing your triple chin to the class as you walk outside, and now lying in bed in the dark, flapping your armpit in front of the camera. It reminds me of the lady from last year who would jump into bed each class and eat a McDonald's cheeseburger, then she would scrunch up the bag and throw it on the floor.

Maybe it's me, but I don't want a bunch of strangers watching me, let alone like that.