The thing is, people keep trying to treat this as a criminal issue. It's not. Not really. The rape scene in a game, the racist comment about buying a "noble savage" figure, even the chant of "old enough..." is not something that will involve the police, let alone go to court. So, why are people trying to treat this like a police procedural where we have to gather evidence, interview witnesses, etc? Good grief, in any other circumstance that would be ludicrous.
Woman goes to a bounce in a bar and says that buddy is harassing her. What happens? Bouncer talks to the guy, and possibly ejects him. There's no interviewing witnesses, reviewing security tapes, or anything like that. Complaint is made, it's acted upon and end of story.
In a hotel, I tell the manager that the people in the next room are being very loud. He goes and talks to them. He doesn't sit outside the room with a microphone and a decibel meter determining if my complaint has merit. No, he immediately calls the room, and tells them there's been a complaint, could you please keep it down.
Why would this be treated any differently?
Actually, this topic can lead to court proceedings. Reference the Honey Badgers at a con last year, with the presenters permission they answered a question respectfully from an opposing point of view to the presenter, and a bit later were ejected from the Con for "Harassment". There is video evidence and they are sueing the con.
It would be great if this were still a normal situation like you describe, but over the past year it has become a weapon to be wielded against those who hold opposing views and has been used numerous times in efforts to attempt to eject people from cons or prevent them from even attending.