'Racial slurs' - is that what Frankie's saying? I'm sure he considers it a sure fire way to silence the critics, but unless the fan was calling Frankie a 'gap-toothed imbred hillbilly cracker' I doubt very much he'd be foolish enough use racial slurs in any Bay Area crowd. He'd be hit by 20k chairs simultaneously.
You're wrong. I'll post the stories of a couple of pitchers from other teams who say that racial slurs are a regular feature of these bullpen fans.