Ignoring for the moment how much of a misrepresentation that appears to be

They invited a racist to speak. Non-racists were uncomfortable with that, and said so. They chose to support the racist. How's it a misrepresentation?

"How many robes and hoods have you collected?"

If someone feels comfortable engaging with racists to convince them that they're wrong, that's their choice. But not everybody is willing or able to do that, and so it's not an excuse for forcing people to choose between associating with racists or not going to a conference or being part of a community.