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He says this to reassure ralph that things will be ok. Simon is one of the most sensitive characters in the book and becomes aware of Ralph's worry. This is also an example of the books theme of herd mentality and social reliance since simon is aware of the effect his words and examples have on the others.
Answer:
a stereotype is an over-generalized belief about a particular category of people. It is an expectation that people might have about every person of a particular group.
I’m not too good in english but i’m pretty sure the answer is polite.