"It was only a little one!!"

The husband and I were enjoying nice conversation with the in-laws on our patio when our youngest K-Bob was standing at the corner and our local officer was stopped at the stop sign, or I should say he was rolling through the stop sign. K-Bob picked up a clump of dirt and chucked it at the officers car. Chad said "K, did you just throw dirt at the police man?" K responds, "It was only a little one!"
Now I know that this should not be funny and he should get some kind of consequence, but you need to understand 3things 1) We have been on this police officer about people NEVER stopping at the stop sign and speeding right through this intersection for 4 yrs (there is a park right by this intersection as well) 2)K-Bob is only 3 and he has heard his dad gripe at people for this same offense.3) It is almost pointless to give this man such a title as police officer because he is never on duty and when he is he does nothing anyway.