i don't really hate anything other than ticks. if there were one critter i could wipe off the face of the earth, it would probably be them. all they do is crawl around and suck blood. yes, i know birds eat them but aside from providing birds with an occasional meal i just don't see why they are here. freakin' parasites. oh, i also hate rust. rust is evil.
there are lots of things i dislike A LOT, my singleator comes to mind, but i'm a pretty happy camper most of the time.
edit: it will likely be changed so i self-moderated. HAH!
i'm still going with my original answer from 2006. i friggin' hate ticks.