Based on other HN rules thus far, I tend to think that this just results in more comments pointing out that you're violating a rule.

In many threads, those comments can be just as annoying and distracting as the ones being replied to.

I say this as someone who to my recollection has never had anyone reply with a rule correction to me -- but I've seen so many of them over the years and I feel like we would fill up the screen even more with a rule like this.