Harassment policies at SF and filk conventions should be simple rather than complicated, should address harassment rather than hurt feelings, and should be clear without forcing the con committee into an untenable position.
Something like this: “If people clearly indicate they want to be left alone, leave them alone. Repeated or flagrant violations may be answered by banning offenders from some areas or functions, or revoking membership without a refund. Threatening or illegal actions may be reported to the hotel or to law enforcement.”
There’s a lot of subtlety in getting the right wording, but I think this covers something close to the right ground. It won’t satisfy the people who never want to hear anything that makes them uncomfortable; I don’t intend it to.