You're entitled to your tastes; just because no other fans of the show chimed in, doesn't mean you need to feel sorry for posting it (though some explanation of relevance to the topic would be appreciated).
So don't worry; in a day nobody will remember this subthread anyway :).
It builds up over time with a slow drip drip drip. Just the constant soul destroying pointlessness of socializing on the internet though comment boards.
Anyways, I googled it and no it is not possible to delete a hacker news account. I successfully disabled reddit, facebook, twitter and linkedin though. So, this is the last outpost of an abysmal time on the web.
So don't worry; in a day nobody will remember this subthread anyway :).