...can't hear you....

Last night Kate and I went on a trip to Target... just the two of us. On the way home we had this conversation:

Mom, I'm going to take my shoes off.
Kate, we're almost home, why don't you leave them on.
No, I'm going to take them off.
Kate, please leave them on.
I'm taking them off.
Kate, listen to my words.
I'm listening but I can't hear you talking.

I guess I lost that one - it's a bit like "You had me at hello". How do I respond to that?