K I've got it figured out. It's not going to completely vanish the entire thing, but it is going to hide all the post content and user details, so all you will see is an anonymous box between posts you aren't ignoring.
Said anonymous box will contain a button labelled "Resume viewing", and this button will have a tooltip on hover which says "Don't do it. You'll be sorry".
There will also be static text next to the button saying "You really do not want to see this post. This person drives you crazy."
This is good enough methinks. Anyone who can't cope with that needs therapy, not better coding.
Devious, treacherous, murderous, neanderthal, sub-human of the West.