It’s a lie, and if he really did check his Twitter feed, he knows it:
Update: Frum triples down:
In other words: Don’t believe what you see on the video, because every moderator of every public meeting is always completely impartial and fair.
Keep digging, David.
Update: A tipster reminds us that, back in December when union goons in Michigan assaulted Steven Crowder, Frum seemed much more concerned about “selectively edited” video.