Please don't submit puns which can be found in other comments already. In general, you should only comment if it brings something new to the discussion.
You are right, it would not make sense to reply now. But at the time of my reply, the user account was 44 days old and the comment was at the top of the submission. I presumed the user among other people were not aware of HN guidelines.
My comment was intended to say that just like your comment might be new to them, their comment will be new to many. So there's no need to police them.
Everyone who signs up shouldn't have to look through all the popular comments of the past and then decide if they can comment or not. If it is annoying to you, downvote it. The fact that it was at the top should tell you that it is appreciated by many, so that comment isn't as well known as you might think.
