There are many candidates, most of whom have been mentioned already, like Boomer Harvey, Goodes etc. One recent retiree who used to shyte me to tears was Maxwell. I have a particular hatred of taggers too, bottom-feeding scum like Crowley, McCaffer, Picken from the Bulldogs, and that scumbag from Melbourne who is such a non-entity I can't even think of his name.
But my hands-down most HATED player is Twavis Choke.