In a debate, two things are important: firstly, the argumentation of one's statements, and secondly, the ability not to resort to personal attacks. If everyone has big problems with the first point, then only he resorted to personal attacks, so the question of decent behavior is debatable. Also, in reality, there was practically no trolling there. Some people just like to play with words and show how advanced they are in online communication.
Where do we end up when we save the world?