My entire basis of being a sports fan, other than my love for the Bills and Sabres, is based on hatred. It makes sports so much more fun.
Without further ado, my five tiers of hatred, in baseball-football-hockey-basketball order:
Yankees
Dolphins
Flyers
Lakers
Dodgers
Patriots
Senators
Duke
Red Sox
Jets
Maple Loafs
Penn
Braves
Cowboys
Rangers
Carolina
Phillies
Redskins
Penguins
Rutgers
Some of these are based on being a Bills, Sabres and (to a lesser extent) Mets fan. Others are based on college affiliation and hating teams liked by people I detest.