Update

I picked Parker up today from school. Our conversation on the way out to the car went something like this:

"Parker, why didn't you potty today at school?"

"I no like those potty at school."

"Why? What's wrong with them."

"I no like those potty at school. They scary."

(Although the word scary was jumbled, I could decipher what he was saying.)

So that's it folks. Diaper at school. Potty at home.