The story would not have made both TV channels if the MP didn’t respond by accusing two of his own (wannabee) constituents of being bad parents. A response to the blog post of “I don’t recall it quite like that but I regret if any offence was taken” would have killed the matter. A Helen Clark apology where you say you regret any offence is often the best way to kill a story.
It is hard to take the moral high ground about MPs should not have such relatively trivial stories blogged about them, when Labour MPs on their own parliamentary blog are running a story about a National MP text messaging during some road opening.
It is a fact of life that as an MP you should be polite in all your encounters with the public – the example I always give to candidates is that being an MP means you can no longer give someone the fingers if they steal a carpark from you or cut in front of you in traffic.
With a story like this, it is not about “winning” the story, but not having it as a story at all. Even if 60% of people back you, and 40% do not, none of the 60% who back you are going to then vote for you because of it, while it is quite possible a fair segment of the 40% minority may be put off supporting you.