According to the story - Farewell to Manzanar, the most painful reason to Papa why others hate him is because they think he is an Inu. An Inu according to the story is one who betrays others.
In the story "Farewell to Manzanar", the women call Papa "Inu" because he was released from the Fort Lincoln prison earlier than other men.
The women who are also expecting their husbands to be released come to the conclusion that Papa must have sold out or betrayed the other men who were still in prison, and that this is the reason why Papa was released faster than the other.
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