I am going to change the team part of it a bit.
1. Andrea Bargnani (I am a Raps fan, and had to endure tthat entitled, unaccountable, lazy POS for seven years, while the GM of the team covered his ass the entire time. Andrea, Bryan Colangelo and his Italian fanboys. Because Bargs is on the Knicks I am enjoying them fail. Didn't really hate the Knicks before this year. In a way I feel bad for Knicks fan that have to put of with his lack of focus, his being a pansy and his stupid play.)
2. Phil Mickelson - Biggest phony in sports
3. Toronto Maple Leafs (I am Canadian, who moved to Toronto for a number of years, only raising my level of hatred)
4. Duke Blue Devils
5. Kentucky Wildcat
6. Washington Nationals (I was an Expos fan, and we had a large message board that was constantly trolled by fans from Washington while they were expecting the team to move. Amazing how trolls can frame you)
7. Big Ten Football (I have never seen a group of fans overrate their conference so much. I am not a huge fan of the SEC, but it always amusing when the BIG is upset that they are not compared to them. Or when the BIG pretends they are the only clean conference ... tough last few years, douchebags.
8. Soccer
9. UConn (Falling Quickly due to irrelevance)
10. Boston Red Sox - I dislike the Yankees as well, but it always amuses me when the Sox nation act like the Yanks overspend at a whole different level and its not fair. Both teams spend way more than everybody else.
Honourable Mention:
Ottawa Senators (annoying little brother), UNC, Kansas, Jim Nantz, Jimmy Dykes, Bob Cole, Tommy Heinsohn, New York Yankees, Notre Dame Football, Georgetown (I know as a SU fan I should hate them more but I only became a bigger fan in early 90s after they became irrelevant), Puckheads, Charley Hoffman Hair (precut), Davis Love, Bug Selig (once near the top) Jeffrey Loria and his midget stepson (Once at the top but time has passed), Taylor Coppenrath and T.J Sorrentine, Aaron Craft, that ugly who used to play center for Pitt.
Special Mention - Toronto Raptors. They say being a fan is someitmes a love hate relationship. For the Raptors being a fan is pretty much all hate.