I can think of only one case of where it's possible for a child to be undamaged by being raised a witless: If the child is a "frog baby"--and then it has no brain, and will die within a day or so of birth. And it will never know what it could have been like.
Aside these extreme conditions, it is not possible to be unharmed by being a witless. They are given a negative view of so many things and then told not to cross-reference any of them. They get persecuted for being different. They miss out on playtime for field circus. They miss out on after school events. They flunk tests because they are too tired (or couldn't study for them) because of a boasting session the evening before the tests. They are forced to sit still for hours at a time at boasting sessions, and are often beaten for not doing so. I don't think a child would be unaffected by all that.