You can use extremes from either side to justify "why I'm not"
Why I'm not a bama fan: Updyke
Why I'm not an AU fan: Chopper
Why I'm not a braves fan: John rocker
Why I'm not a republican: that guy
Why I'm not a democrat: Sharpton
Why I'm not a film director: Oliver stone
Why I'm not a pop music fan: bieber
Why I'm not a rap fan: vanilla ice
Why I'm not an American: Obama
Why I'm not a socialist: Obama
Why I'm not a communist: rosa parks/MLK
And so on.