Gan's mother will remember this moment as a humiliation because she feels that intoxication is a way of oppressing her and humiliating the human race.
Gan and her mother are living on an alien planet, where the inhabitants have the ability to poison eggs. He and his mother live in a settlement for humans, where they are oppressed and looked down upon by the natives of the planet.
These natives have the ability to intoxicate eggs and lay these eggs for humans to eat.
Inappropriate food is what makes Gan's mother feel humiliated.
This question is about "Bloodchild" by Octavia Butler.
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