This appears to be a perspective issue. The writer took it as rude without mentioning the most important part: Was Katz right? We need more context, and we need less emotional argument. If the original presenter could effectively support his position then he would not have left the stage. And I would hope that Katz would not commit such a social atrocity without a very, very good reason. I don't find it hard to belie…
Answering that question doesn't really get you very far.
Katz could have politely disagreed without taking over the presentation.
Katz could have taken the author aside afterwards and shared his perspective.
Katz could have offered to assist with a revised presentation.
There are all sorts of ways to politely and tactfully correct someone. Doing it in the manner described in the original article doesn't seem like the best approach.