What reason does Emperor Qian Long give King George lll for not sharing chinese civilization with the british?

Ahe thinks china has nothing to offer the british in terms of customs.
BHe worries China will lose its superiority if it shares it cultural traditions with another country.
CHe believes that chinese people wouldnt understand the more sophisticated ways of the british.
DHe feels that Britain could not successfully transplant chinese culture into british culture.

Commercial restrictions on selling their own products in China were a source of frustration for Cantonese Europeans. The British, as well as the Dutch and other Europeans, were eager to sell their products in China, and organized several diplomatic missions to the Qianlong court in order to secure concessions from the throne. The two most famous Western missions are the Macartney Mission of 1793, and the Titsingh Mission of 1794.

The mission of Lord Macartney came at the behest of the British East India Company. The main motivation was the opening of the Chinese market to exports of British products, and the possibility of trading directly with other ports in China. George Macartney, the British ambassador, arrived in China in 1793 accompanied by George Staunton and was received in Rehe by Qianlong. Lord Macartney's requests to Qianlong were varied. The British wanted the reopening of international trade in the ports of Amoy and Zoushan, as well as the opening of Tientsin and Zhejiang in northern China. Likewise, they asked for the possibility of trading directly with Chinese subjects, and not through the Hong intermediaries, and above all, the possibility of importing British manufactures into China. They also asked for the granting of an island in the south coast of China where they could establish a commercial factory in the same way as the Portuguese in Macao.

The mission was a failure. Lord Macartney and his entourage refused to practice the customary ritual prostration before the Emperor, insisted at all times on establishing diplomatic relations on an equal footing with China, and their requests were completely unacceptable to Qianlong, who rejected all commercial openness in the famous Second Edict of Qianlong to King George III. In it, Qianlong used Chinese ritual forms that implied that he treated the British monarch as a vassal.