I am a huge proponent for constructive criticism. It is genuinely helpful when I receive it so I attempt to give it as much as possible in 'Show HN' and similar

I am a huge proponent for constructive criticism. It is genuinely helpful when I receive it so I attempt to give it as much as possible in 'Show HN' and similar posts. Most of the time my comments get a couple up votes and left in the middle of the thread. Sometimes the founder responds and we have a little conversation that is hopefully helpful to both of us. The one time I've ever posted a comment that could come off as mean spirited (I pointed out a pretty glaring design flaw), it became the most up voted post I've had on HN. I felt bad because the founder responded with his reasoning and it seemed perfectly valid. I wonder if it would be plausible to self down vote a post (that is weighted heavier than just a single down vote)? I know I didn't want that post to be the first thing someone looked at when they clicked on the comments; that was not my intention at all. Just something to think about.