He interrupted throughout the talk and then gets up on stage at the end. Quite disrespectful, and it's not even the talk I was looking for.
Side note to flaggers: defend your decision please. I see no real errors in the comment. We're here to discuss.
As I understand it, conference talks deliver their message first, THEN have a Q&A at the end where details can get sussed out or corrections issued. Lennart's time to complain or correct was after the talk.
I've been to talks where the format is deliberately more conversational. Lennart's raising that point when questioned specifically made me wonder if the room was already such an environment that day.