Where to start? Besides that it's oppresive, based on bad science, reductive, reactionary, and small-minded.

Those feelings of insecurity are there because of a conservative cultural context, that shames difference and enforces conformity to an arbitrary norm.

Put bluntly, this system of belief will prevent you from learning real things about the world. If you constantly avoid genuine interactions with people because those interactions scare you, you'll never learn why those interactions are not actually scary.

I would direct you to Plato's cave. Petersen is asking you to take the shadows on the wall at face value.