Please understand that saying that someone is "dumbed-down" is not the same thing as saying that they are dumb. There are loads of folks in the world - perhaps most of them - average folks - who are not 'dumb' by any means - they are quite intelligent. Nonetheless, they are "dumbed-down" - in the sense that they have been lured into a certain kind of thinking that overlooks and/or ignores the reality of the world they live in.The problem - and, why the world is in the shape it is in - is that there are waaaaaaaaaay too many "dumbed-down" people in the world who are way too proud to admit that it is even possible and refuse to look at, see, realize, understand, and accept the reality of it.
The fact that folks are not 'dumb' is a reason to try to get them to think - and, to "wake up" - because they are perfectly capable of thinking - and, considering what you are trying to get across to them.
What is important is - realizing that you have been targeted with such manipulation - to "dumb you down" - is the first-and-necessary step to being able to avoid such manipulation - to do the opposite - to recover from being "dumbed-down" - to be able to think more critically and clearly about everything you encounter in your everyday life.
It is not about how 'intelligent' you are - it is about how 'aware' you are.