Why is it called Koryo bonzi?

There are generally three kinds of statements:

1. The origin of bonzi, many people know that Koreans are also called bonzi, but they don't know much about the origin of bonzi. In fact, the title of bonzi was given by Emperor Qianlong. Bonzi, that is, wooden stick, is a dialect in Beijing, which means ignorance. In the words of ordinary people, it is half-baked. That year, korean king came to Beijing to visit Qianlong. Ganlong was so happy that he hosted a banquet in the Forbidden City. During the dinner, someone brought a basin of hand washing water. In order to disinfect and increase the fragrance, some petals and salt were added to the pot. Han Wang thought it was soup, took a few sips and was full of praise. Qianlong saw a smile and said that Han Wang; "You are a wooden stick. Han Wang doesn't understand. He thought the emperor made him a big official. Thank you quickly. Since then, Koreans have been called bonzi. In other words, Koreans are ignorant;

2. When Japan occupied the Northeast, most of the low-level security guards were Koreans. Because they are also second-class citizens, the Japanese don't trust them, they don't have guns, they just send a stick. However, these Koreans like to bully China people and beat China people with batons at every turn. So people call these Korean security guards Koryo sticks.

3. Bones generally refer to Koreans. Korea used to be Korea. South Korea is rich in ginseng. Ginseng is called a stick in China. So there was the habit of calling Koreans with Korean sticks;

Korean originally meant the traditional trousers worn by Koreans, but after Japan and South Korea joined forces, it became a disparaging name for Koreans by the Japanese.

I know from other Baidu.