Eh, those kinds of things just come with the territory when you're a Stevie and/or Fleetwood Mac fan.
Personally, when someone says something about Stevie being a witch (or a "coke-head," or whatever else), i just smile, and in a "couldn't care less" kinda voice, I say, "How nice for her!"
That stops them dead in their tracks, because it wasn't the reaction they were hoping for.
Really though, anytime you're a fan of *anyone,* there's always someone who's going to make a bitchy comment about them... so keep that in mind.
Johnny Stew