Tell me what you think of the "strong ignorance" of northerners.

Northerners obviously don't know that water chestnuts have to be shelled before they can be eaten, but pretend to know. Finally, they said that water chestnut grows in soil. Vividly and profoundly satirized this "northerner" who didn't pretend to understand and was ignorant. If this northerner can know his own shortcomings and learn with an open mind, he can "know the spirit" and "shell". Who knows that he actually defended his shortcomings, thought he knew, and deluded himself into defending the "entrance to the shell", and even made a joke that "the front mountain is in the back mountain, but there is no one there".