Some of you don't know how to use it. I'm here to help.
You block someone because they annoy you, **** you off, are amazingly stupid, etc, etc. So, when you block them, you really just don't want to be tempted to engage with them because you feel any discussion with them is pointless.
So, once you've blocked them, don't hit "SHOW". And especially don't hit "SHOW" and then respond to them. That's just dumb.
One recent user not only blocked me, he encouraged others to do so. Then responded to my next half dozen posts. I don't know what the hell he's doing but he ain't doing it right.