Exactly this. I was hoping that when I clicked through on this story, that I would read about that happening. Sadly, twas not to be.
Even if it was a niche hacker conference that most "regular" people have never heard of, if he'd been booed off of the stage and the media had given it any attention at all, it would have been a symbolically meaningful moment and a powerful message.
Here's one alternative idea: If you can organize enough people for it to look good on camera, a coordinated walk-out could be effective. Tip off a few key press folks in advance, so they know to shoot B roll of people walking out. Then you hold a short press avail in the hall outside the ballroom, delivering a statement with all the people who walked out massed behind you.
It's still confrontational, which the press likes, but it appears more civil and organized.
Those in power keep trying to present this as a "conversation" or a "dialog," but that's absolute bullshit. They're not actually trying to have a conversation, so we shouldn't behave as if that's what's happening. The most powerful thing we could have done would have been to boo him off the stage.