How old was Claudette when she found out what happened when blacks acted up against whites and how did she acquire that knowledge?

She was four years old when she found out what happened when blacks acted up against whites. Some white boys came up to her and wanted to see her hands. They touched each others' hands and the boys laughed. When Claudette's mother saw them, she came up to Claudette and slapped her across the face and told her that she's not supposed to touch white people. The white boy's mother agreed. She learned to never touch white people again.