Right, putting being an internet wanker aside for a minute, this really isn't the best idea.
Say someone has me on ignore for no reason other than I once posted something disagreeing with/mocking them slightly, then they start a thread that has a brilliant subthread. I would then miss out on said subthread purely because someone else can't take criticism/a joke. It's just going to become another thing that is ruining the site, like the reply function in /qotw turned that into a hive of bitching and upset.
( BraynDedd Natasha Kaplinsky's labia majora, Wed 1 Aug 2012, 21:22, 1 reply, 13 years ago)

Awww. Blub blub blub.
When was the last time anything approaching an amusing subthread ever happened here ever like ever ever? Prick.
( Dr. Shambolic je suis charlie, Wed 1 Aug 2012, 21:50, Reply)

If I had 'Ken' Oaf on pricknore
I would have missed his funny little tantrum and then where would we be?
(dozers, do fuck off ur a nob m8, Wed 1 Aug 2012, 21:54, Reply)

If you were that desperate couldn't you just log out or use a different browser or sutin?

( Dr. Shambolic je suis charlie, Wed 1 Aug 2012, 21:58, Reply)

oh man, I'm addicted to trolling.
You fucking cripple.
(dozers, do fuck off ur a nob m8, Wed 1 Aug 2012, 22:02, Reply)

Oh man. I can't believe you'd tease me about my inconveniently massive cock and balls.

( Dr. Shambolic je suis charlie, Wed 1 Aug 2012, 22:04, Reply)

THAT'S IT, I'M PUTTING YOU ON IGNORE, YOU HORRIBLE BULLY.

( BraynDedd Natasha Kaplinsky's labia majora, Wed 1 Aug 2012, 22:34, Reply)