Reprimanded by a Three year Old

Today we were getting ready to leave for Lucas' final swim lesson and I got a good talking to. I was trying to get Lucas to hurry along and get his shoes on so we could go. I guess I said something like, "Lucas, you need to put your shoes on, let's go." I probably said it with some intensity I am sure. Well, Lucas turns to me and says something like, "That's not nice. Can you ask nicely, Mommy." Can you tell what we have been working on around here?