It's a joke that this question has not been deleted yet. Hoping to wake up a moderator by posting here.
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Don't feed trolls like this one. Stop responding to them in any way, period.
Flag for moderator attention (or post on meta).
Attention is what they want; it doesn't matter if that's positive or negative. Even though you are trying to revert vandalism on the site, responding to them encourages and escalates so they work harder to get around bans and other countermeasures.
It may be difficult to leave "<your name> is a bastard" on the post even for 10 minutes, for example, but realize it will soon get deleted. You can always come back to address it later, if it doesn't. (We have better things to do with our time than click rollback every 42 seconds, anyway, right? :P)
I'm really surprised this didn't reach the offensive flag threshold and get auto-deleted, which I would expect for this kind of behavior.
That's what we need to think about here. Why didn't that happen?
(note that it was at -20 so any edits wouldn't push it to the front page; we don't allow highly negative posts to appear on the front page of the site)
Maybe The Cat is right, leaving the offensive text in would have accelerated this process, since the rollback cycle interferes with offensive flags. If there was nothing to roll back to..