What? I'm considering why we find "screen time" especially distasteful. It just
looks bad, for some reason. Worse than someone lounging and reading, worse than a person running or playing a sport, and so on. It's an unsettling activity to watch, and catching a glimpse of oneself doing it is particularly creepy. I don't think I wrote anything about yelling at people. Did I?
[EDIT] I think "using a computer" posture especially is the worst. Something about sitting upright at a desk or table using a computer is really weird. Like the person's body's subservient to the activity, while also being kind of absent from the whole thing. It's much worse than bending-neck-to-use-a-cellphone or slouching-on-couch-playing-console-games look.