Yes it may be bad form to mention your own score, but it's equally bad form to downvote for asking a question, or read into a question something that wasn't said which may require a down vote.
Why don't you take the time to answer the parents question rather than downvote them for querying why their question got downvotes?
If there's anywhere that appreciates the gaining of knowledge on the internet, surely hn must be one of the top candidates. So why downvote questions? And yes it's happened to me multiple times, and it's bloody annoying. Doubly so because you know if you try to clarify you'll get someone downvoting you because why? I don't know. Because that would be 'bad form'? BS.
/Rant