Fun with housebreaking

In the last couple of days we've had a slight regression with housebreaking. Yesterday I took him out he peed and after 5 minutes we came back in. Daddy was upstairs taking a shower and I had the audacity to take my own pee break. All of a sudden, I hear insane barking which could mean anything: a real problem, a favorite neighbor walking by, a toy stuck under the couch. I came out of the bathroom kind of quickly, to find him barking at his own poop. He waited until we got back inside, and until he was alone to poo on my very nice rug and then he was indignant. Daddy said I was giving him too much credit after he went into his crate to pee and then nonchalantly came out. But having been a rebellious teenager, I think I know defiance when I see it.