Mud and poop

This morning I put Trevor in a shirt with Disney's Cars on it playing in mud.  He ran and played for about a minute then came back and said "It's dirty" pointing at the shirt "It's poopy." I gently replied, "no buddy, it's just mud."  "No, Mom, it's poop."  He then proceeded to take his shirt off and pulled a different one out of his drawer.  Hey who am I to argue with a two year old if there's poop on his shirt?