Oh goodness, where to start. I don't think there is any breed that I really hate. However, Welsh Cob is probably in my top five. I leased one for a little bit, cute horse with the sweetest temperament.
He had the biggest movements for being only 15 hands.
Anglo-Arabs are currently my number one, I have been really impressed with the gelding that I am leasing right now, Majic. It's like the best of both worlds, the beautiful movements of the both the TB and the Arab, along with the athletic ability, minus the hotness.
I also like Morgans, Appaloosas (really like appendix appaloosas), most draft breeds, especially Percherons, TWHs (want to have one some day for sure), and quarter horses. Oh, and I love warmbloods of color, my dream horse is a black warmblood stallion with tall white stockings and a bald face (thought I am not really picky on breed, those are more my dream markings).