Exoteric commonly means intended for or likely to be understood by the general public. The general mass of humans are given words, ideas, teachings, morals, myths, analogies, philosophies, memes
as a way of controlling their behavior. As a bull is controlled with the aid of a ring thru his nose, the masses of humans are controlled by means of exoteric knowledge.
Zippy was hard to control because exoteric knowledge escaped his micro-cephalic mind.