The reason given by Mr. Pei is: If you have only seen white boiled eggs, yellow scrambled eggs, and white and yellow fried sun-cooked eggs in your life, then suddenly someone cheated and gave you a brown and green half-cooked egg.

It’s an egg-shaped unknown object that is transparent and exudes a pungent smell. If you see it, you will definitely be scared to pee. How could you eat it?

I guess the reason why Mr. Bei doesn't dare to eat preserved eggs has something to do with this. He just feels bad that such delicious preserved eggs have been criticized like this.