This is a trope of the serial troll. If you don't want to be banned from HN for trolling, please communicate in better faith.
I don't believe 75j is a sock-puppet account. I think it's the primary account that user is currently using. They need to do a better job of following the site guidelines, and I've chided them about that in this thread, but it doesn't mean that what you've done is ok. Your vendetta is not only uncivil to a fellow user you're tweaking the nose of, but is the worst sort of procedural droning-on. No more of this, please, starting now.