Let's assume that's the case (although it's a strange custom because, again, it's quite conceivable someone comments something that in itself is newsworthy and comment-on-able).

If it's impolite, presumably the magical social filter will take care of it by downvoting or ignoring. Calling in the heavy artillery for something trivial like that is still ham-handed and unwarranted. You can't have said something like that unaware that it will end up all over the place anyway, as it did.