Welcome to our living room. You knocked, we let you in and gave you a chair. We welcome intelligent, humble, appreciative fans from other teams who wish to have intelligent dialogue about football strategy, personnel, coaching, etc. There's a guy from the Dolphins who shows up regularly, and another one from the Broncos, and then the routine drop ins from fans of teams playing the Pats that week. Sometimes we even offer a beer.
Anything other than that will be met with derision and scorn. It will be worse if we get smack talk from fans of teams that have never appeared in, much less won an NFL Championship game, which our team has now appeared in six times. No, wait, seven. Or is it eight? I'm losing count. Anything less than that is considered at least a disappointment around here. That's just what happens with routine excellence.
Remember, this is our living room. You are a guest. You should expect to be given some sh$t. Take it gracefully and you'll get some respect.
If you'd like to experience the consistent excellence and winning, you can always switch team allegiance. Just be intelligent, humble, and appreciative in your application essay.