Deggans's friends made fun of him because:
According to the complete text, we can see that the setting of the story is set in the period when racial tensions were still very high and people were wary and sensitive of what they said.
As a result of this, we can see that Deggan made an unconscious error when he made use of a word that his friends use to associate with white people, so he was laughed at by them
Therefore, the correct answer is option C
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