Well, from this list the first one I can easily mark off are Giants. I never have much problem with them since I leave them alone unless they attack me (for whatever reason) or a quest requires me to kill one. Since these encounters are both few and far between, I don't have much to do with them. In fact, I think they're pretty cool, I only wish I could communicate with them someway.
Frostbite Spiders are another that doesn't bother me. They're pretty easy to deal with and I like the atmosphere of going through a cave that has spider webs and cocooned prey everywhere. They also look well done, though it'd be kinda cool if they would flip over to their backs and twist their legs when they die.
Out of the others in this list, the most annoying would be Dragons, for obvious reasons. But when one shows up, I usually go and hide in a nearby cave for awhile, 'til it pisses off so I'll pick another.
'General humanoids' - fucking mages. Magic is like my worst enemy in this game, since I currently have no magic resistance equipment. So all kinds of Forsworn mages, Necromancers and Conjurers I hate more than anything else. Bastards they are.
Skeevers too, since they're so small, you never see them in the grass or whatever, and they scare the living shit out of me when they attack me from behind or whatever. Damn.