it's a tough situation. i think when you are presenting your own work or framework and teaching people how to use something that you have made, these comments a

it's a tough situation. i think when you are presenting your own work or framework and teaching people how to use something that you have made, these comments are quite rude. on the other hand if the speaker does not understand a concept which he did not invent and misrepresents it to an audience expecting to learn, it justifies some sort of a response which is not private. if a speaker said 2 + 2 = 7, as an educator or evangelist, it would be irresponsible to let the audience assert this as truth and only report it in private afterwards, when hundreds of people have been mis-informed. ultimately it's the responsibility of the event organizer and the speaker to ensure that blatantly wrong things are not "taught" and that the presentation is peer reviewed before being given without disclaimers of credibility etc... i'm not excusing Yehuda's behavior, especially if it was for minor nits and/or involved a speaker's custom architecture rather than general concepts.