Which great god can help me explain what the "Indian giver" really wants to express?

Example 1. "When the first white people immigrated to the United States, they were very surprised by the cultural habits of the Indians. For example, when a white man feels cold, the Indian will give him a blanket, but the white man mistakenly thinks it is a gift, so when the Indian wants the blanket back, the white man will feel very unhappy. Indians will also be disappointed because they find that white immigrants have no intention of returning their blankets. " This passage is from Robert's Rich Dad and Poor Dad. "

Example 2. An American visited a friend's house in China, and the food was very rich. People in China always give priority to humility, and there will be some food left on the plate that can't be eaten. Americans, on the other hand, have to finish their host's meal to show their respect for the host, which also means that the host's meal is delicious. So the American guests finished the food prepared by China people. People in China think there is not enough food, so they prepare food again. Finally, the American guest went to the hospital because he ate too much.