As they finish baking the cakes, Buddy's cousin begins to cry. Why does Buddy's cousin spend the evening in tears in "A Christmas Memory"?

After baking the fruitcakes, which include the ingredient of whiskey, Buddy and his cousin enjoy the last of the whiskey themselves.  They have a pleasant evening in the kitchen, laughing and dancing and singing.

However, the other memebers of the family come in and realize that Buddy's cousin has given him - a child - alcohol.  Instead of evaluating the situation, instead of speaking with this member of their family, the other adults attack her.  They tell her that she is a disgrace and has behaved ridiculously.  This is what puts Buddy's cousin in tears.  The other adults do not treat her with equality or fairness.  They treat her as is she  is a child, even going so far as to scold her.