You shouldn't say that...

Well my bold little man did it again. We were at the library on Monday and Cade was looking at books while I looked for some for my class. A younger mom was sitting near Cade and for some reason she said "stupid." As I was getting help from the librarian I hear my sweet little Cade reprimand this mom and say..."You shouldn't say that word!" She kinda laughed. Apparently she didn't learn her lesson because just a few minutes later she said "what the heck?" As I hurdled the librarian desk to grab Cade before this potty mouth mom did he chimed in again with "you shouldn't say that word." She didn't laugh.