wlonh and disectamac said their pet peeves were people whom post the same thing that had been posted before. After these posts, Blizaine then said his pet peeve is people whom post the same thing that had been posted before. His "worse" pet peeve is exactly that of wlonh and disectamac, thus satirizing their pet peeves.

I hope this helps, but I think I've taken the wittiness out of the jest.