You seem to be under the impression that your ignore lists banishes people from the internet , like if you block them then they are cut off from the internet , but the only person that you are blocking off is yourself , because you are the only person who cannot see the posts , everyone can see then . Its jjust you
If you didn't keep on telling them no one would be aware that you put them on ignore , and even when they do know , it doesn't bother them at all