Permaban, well that's rough:p
Maybe a bit too harsh for a badly thought through joke?
Well, not the first time.
Murder was banned before for having posted GoT spoilers in his diplomacy thread.
So it was kind of obvious what the consequences would be.
However, I do agree that people should get over it.
The books have been out for ages.
Also I agree with Pestdoktor. I will never get how can a TV show possibly mean that much to you that you that a spoiler ruins that episode, or even multiple episodes for you.
But that is down to everybody to decide for themselves.