Mostly Seattle fans because they act like their team won the most SB's. Also, they only come out when their team wins. From 2006-2011, i don't think i saw one seattle fan. Now, I saw like 3 or 4 of em in the past few weeks.
I also cannot stand steeler fans. I use to respect them, but not no more. Last year in OAK, they invaded that stadium (when they were "winning") And now, since they suck, only a small fraction of the fans were there. One of my good buds is allegedly a huge steeler fan. (he's from cleveland, but he likes: steelers, SFgiants, la lakers, and ohio state football.) He even have a huge tattoo on his arm. However, the steelers were playing in OAK earlier this year on his birthday. I suggested that he should see his team there. He told me, "nah man, i don't want to see them." And then he spent MORE MONEY to a concert of this no named rapper. And then two weeks ago, i guess PIT had won 4 in a row, and this fool had the audacity to post a pic of his steeler tattoo on facebook like he's a fan again.... I hate fans like that.