Actually if your looking to nullify the law/rule you vote guilty according to the letter of the law/rule but because you disagree with the law you vote also to not punish the accused, if I understand your question right. :)
Sounds to me like he’s tired of constantly being ‘ambushed’ either with small talk or someone wanting his opinion on something. He’s got three shows he’s running which has to take up a lot of his time as it is.
Seems to me that even the nice guys (I don’t know if he is one or not though) have to put their foot down every once in awhile.