I think people think "smarter" because they envision that most Android users know how to do more than set up their phone and just use it.
A good many have NO idea and probably should be using an iPhone, but they get sold on Android due to hardware they like, price, friend told them it was better, etc.
There's an entire segment of Android folks who ARE smart and do customize their devices, know how to guard against viruses, etc.
But, that is NOT most of the people I know who use Android phones. Hell, plenty of them can barely use the camera properly. I know they're not rooting a phone.
Another group of people know how to do all that but choose an iPhone because they can’t be bothered to MAKE their phone work.