You unfortunately can’t teach something like this to someone who doesn’t even understand the consequences of it. Or care.

You can absolutely explain it and teach it and make people care. It’s just not easy. I’ve only ever encountered uninformed “I have nothing to hide”-responses to equally lackluster throwaway explanations . It’s a very difficult and abstract topic, it doesn’t come naturally! Don’t treat privacy concerns as equivalent to pointing out dirt on someone’s clothes, treat it like calculus. Successfully conveying it requires time, conversation and didactics.