I dislike
Buffy/Angel but they are not anywhere near as bad as TVD romance right now
They may be not my most hated couple ever, but definitely THE most disturbing and irredeemable one.
Couples that make my eyes bleed, offensive to build up, sense and overall existence of fiction:
Harry/Ginny
Buffy/Riley
Tyler/Caroline
Klaus/Caroline
Cook/Effy
Lucas/Lindsey
Lucas/Brooke