sarcasm from a 5 year old

Today I went to church by myself because everyone else in this house is on the verge of getting sick...Bob had the chills and aches...he never gets sick...Lindsey had a sore throat and headache....and Kyle has had a deep chest cough for several days but is on the mend...So as I was leaving, I said to Kyle, "Daddy, doesn't feel well, so be a good boy for him while I'm at church." His reply, "No, I'm going to be a bad boy for Daddy." He stopped me dead in my tracks... If I didn't know better, I'd say he was mocking me, that little stinker...