Final answer:
Landon's thoughts demonstrate ethnocentrism.
Step-by-step explanation:
Landon's thoughts demonstrate a cultural bias or ethnocentrism. Ethnocentrism is when someone views their own cultural norms, values, and practices as superior to those of other cultures. Landon thinks that eating snails is disgusting and wrong because it is unfamiliar and different from what he is accustomed to. This is an example of ethnocentrism because Landon is judging the cultural practices of another country based on his own cultural norms.