Freo is really the only one I've held a hatred for, Hated The bombers in hte 90's for knocking us out of finals, and always seeming to beat us when it counted. Hated the blues for the same reason, well not so much finals, but that game we were robbed at Princes park when Evans soccered it and Carlton claimed, and were given the goal that won them the game.
Most of that hatred has mellowed and gone, never hated the pies.
Freo however have and always will be my most hated. I know too many freo supporters who in general know nothing about footy. I'm not aloud to bring up any of our past glories, but they are aloud to bring up last years choke, and all their derby premierships

They all seem to have a massive chip on their shoulders and just can't get over anything. Then of course they have f**k heads like ballantyne, mayne, crowley etc sho as players annoy the shit out of me just looking at them.
As a West Perth supporter I hate everyone, cause everyone hates us

Again just jealous of our many triumphs, much like freo supporters!!!