Dean is aware being a demon child isn't your fault, you didn't choose this, but your demon abilities were a little too much. And yet, he still felt protective over you, hence you're just a kid.

"Come on, it's not that hard, use your good foot." He said as he encouraged you.

He was playing soccer with you in the bunker, trying to help you have some fun after he yelled at you earlier because he lost his temper.