@Em0nM4stodon When people ask me that, I usually ask them if I can see their phone or computer, or if they can login to their bank account for me. When they say no, or when they pull their phone away when you go to the home screen and start launching apps, I ask them I thought they had nothing to hide. Some get it. Eventually. Others, sadly, don't get it. But I got a few people to suddenly "get it" that way.
@travis This is a great way to demonstrate it! No better learning than with experiences... in a safe setting ;)