The Montreal Canadiens have a very annoying fanbase who don't seem to realize they have not won anything for almost 30 years, they are easily among the worst/least friendly traveling fans I've encountered at games

The Dallas Cowboys.  Hate em everyone calls them America's team and they're my team's biggest rival.

I have to agree with Koyuki about the bullshit with Dallas being "America's Team". They haven't been America's team in almost 50 years. Pretty much everybody outside Texas hates them. Oh, and fuck the whole state of Texas, too.  That being said, the Pittsburgh Steelers are my most hated team. They are rivals of my team (Cleveland Browns), so that's reason enough.  If any other reason were needed, they have a tendency to take dirty, cheap shots on defense, purposefully trying to injure the opposing players.  Also, they think they are entitled to win the division every single year.  So yeah, fuck Pittsburgh, too.

the indian bear cats, because they never win

Also: Fuck Jerry Jones, fuck Lakers fans, and fuck the SEC division of NCAA football.

Southampton or scum as they are known here in Pompey.

<font color="#D7D7D7">Rangers in Scotland, screw those guys.</font>

Buffalo Bills because Lucifer-Morningstar told me they were a terrible team. 

Dundee FC

Birmingham City FC

Rangers

Celtic

Everton, mainly due to you supporting them.

My favorite hockey team would montreal canadians 

I, as well as the other knowledgeable people in this thread, hate Liverpool. I truly hope that the FA grow a pair and void the league. My hate has grown for them this season because of their arrogant fans and scummy owner. 

Two teams I hate with a blind passion. Olympiakos because they represent everything corrupted and rotten in most aspects of our society and Aris because I was born and raised knowing to hate them and their sickly, pale horrible yellow colours.

Any team from Liverpool is worthy of hatred, frankly they're ll scousers and that's all that needs to be said really

Horrid oiks.

Wilbur, you're in Gorgie?  I lived on Orwell Terrace for a while.

I'm on Hillside now - painfully close to Easter Road, whilst being comfortably distant. 

The Patriots, mainly because I am so tired of them winning, also becasue they cheat repeatedly. The Leafs because I like the Canadiens. The Yankees because I like the Jays and New York just out-spends everyone it gets old. Basketball I dunno, maybe the Celtics? 

Golden state warriors just because of the bandwagon