Because China is a great historical country with a long history of 5,000 years. South Korea is just a small country that appeared later. Historically, South Korea was actually a vassal state of China. It was not until modern times that the war established its own country independently of North Korea on the 38th parallel. Korean clothing is obviously based on Hanfu. Because they used the traditional culture of China for reference in history, but they haven't figured out where their culture originated yet, and they think that some things in China are their own. Because of their small land area, harsh geographical environment, no representative crops and cold climate, they can only take kimchi as their staple food.
In fact, it is very unwise to argue about kimchi, because kimchi, as a very common thing, may appear in various countries and regions and cannot be monopolized. It cannot be forcibly said that it is a unique cultural product of this area. Most Korean netizens think that everything originated in South Korea, and their comments have also caused dissatisfaction among many people in China. It has happened many times that they show their national self-confidence with a narrow screen name in a very small country. Not only small pickles, but also the Dragon Boat Festival is competing with China. They even think that China's Hanfu is a copy of Hanfu. Even a saint like Confucius thinks it belongs to his own country, not to China.
But they don't understand ancient history at all, and they just lie according to the present. As early as 3,000 years ago, the world's earliest kimchi appeared in China, and some ancient books in China recorded that there was kimchi in China. Therefore, we should respect history and be wise on the basis of looking at problems.