IMO the ignore function is a double-edged sword. When I use it and inform the poster, in my mind I am thinking of them as either a blithering idiot, or a nasty piece of work. OTOH, they may be exulting in having annoyed me sufficiently.
If I put a poster on ignore without telling them, there's no satisfaction.
Nowadays, I either ignore a poster by not responding, or respond with facts which refute their delusions. There is a reason for my nom-de-plume.