I'm a Seattle native and only moved away 2 years ago. Was in Chicago last weekend though and got nothing but compliments on my Hawk gear, so it hasn't been a problem for me. I also live in Rams country but they don't really seem to care; example: my brother came into town from Seattle for the @Rams game last year and a shopkeeper congratulated us on the win as we were walking to the game (it hadn't started...).
Most of the browbeating IMO comes from Hawk fans here, yes, even on this board. Being a Hawk fan never had currency before, but now that we win an SB, a few folks want to get into a d1ck-measuring contest about how many years they've been fans. I'm as much a fan as anyone, but that's obnoxious, and we'd all be well-served to keep it in perspective: these players are by and large non-Seattle guys who don't know you exist, don't care about you, and don't want to hang out with you or lift a finger for you. The monent you stop paying them what they think they're worth, they'll happily go to San Diego or Indy or even SF. I was cheering before the SB and after--if some folks are only here for the good times, so be it. The more the merrier. I'll still be here when we're not winning. Enjoy the good times.