For what does Uncle Jack reprimand Scout on Christmas Eve in Chapter 9 of To Kill a Mockingbird?
Atticus, Jem and Scout spend each Christmas Eve and Christmas Day at the family homestead at Finch's Landing with Atticus' sister, Alexandra, and her husband, Jimmy. Scout's cousin Francis (Alexandra's grandson) is also there, and the two of them never get along.
... he enjoyed everything I disapproved of.
At their Christmas Eve dinner, Scout cursed several times at the table, and Jack admonished her about it. He told her it was unladylike for a young girl to use such language. The next day, Francis was busy insulting Atticus, calling him a "nigger-lover." When Scout had her chance, she
...split my knuckle to the bone on his front teeth.
Scout's Uncle Jack spanked her after he caught them fighting, but when Scout revealed her reasons for doing so, Jack regretted the punishment he dealt out.