The son had also hassled some of his friends.
He said he was pretty angry on the day he damaged the letterbox, but he now realised he should have just left it alone and stayed clear of the son.
Judge De Ridder asked Stevens if he had problems with anger as he was convicted of disorderly behaviour last year, but Stevens replied that offending was the result of alcohol and he had stopped drinking booze about six months ago.
"This [latest offending] was just one of those days," Stevens said.
Judge De Ridder said given Stevens' early guilty plea, the fact he had completed an anti-violence course previously and that he had explained the circumstances surrounding the offending clearly, he convicted Stevens and ordered him to come up for sentence if called upon in the next six months.
The sentence is essentially a good behaviour bond and means that if Stevens does not offend again in the next six months that will be the end of the matter. Judge De Ridder also ordered Stevens to pay $129 reparation for the cost of the letterbox.