NFL - Titans and Patriots, but to lesser extents, Cowboys, Colts, Texans, Redskins, Bengals and Saints and probably some others, depending on the mood I'm in.
World Cup Soccer - Wales, Scotland, Russia, Argentina, France, Italy and Australia top my list of teams I want to see lose, but I don't care so much about international soccer these days.
Club soccer is even more complex and I hate just about every English club soccer side when we play against them and can probably rank all 92 league clubs, given time. Cardiff City, Bristol Rovers and any club managed by Neil Warnock are usually near the top of my list.
Everything else - don't really care.