It's hardly the first or only Victim Scam, either. Think the Duke rape accusation, or the fake racist messages on college dorm walls, or the anti-trans message recently that turned out to have been written by the school's transgender LGBT group leader.
Activism is only good when it has a clear and negative target. Without a target, it sometimes goes crazy and tries to create one, to foment anger and "spirit of change" where none exists. And then we get stuff like this.
I feel sorry for the innocent customers here - being framed for moral crimes, having their lives potentially destroyed - whether it was the waitress who framed them or a coworker, they are as much the victims as anyone, potentially moreso.