Cunts then?

Why do old people think it’s ok to have their phone on loud speaker mode in public?

Because a mix of hearing loss, habit formation from private environments, reduced sensitivity to social norms, and mild technological incompetence leads them to treat a phone call like a face-to-face conversation; the device becomes a shared audio object rather than a personal one, and since the immediate utility of hearing clearly outweighs any abstract concern about bothering strangers, they default to speaker mode without recalibrating for public space.