Are you unable to complain to the sponsors of the event? Where did the man come from in the first place? You didn't say--and how was it that he was speaking, at all?
The guy who runs the event was the moderator, and heard everything the guy said. It seemed that the more kind the moderator was, the more annoyed the idiot got at his kindness. It was a very zen experience *LOL* It was a volunteer meeting and judging from what the guy was saying today, I think he will not allow them to volunteer. GOOD!