"Why forum members insult one another" is universal, as far as I can tell. This "insulting one another" is true of all forums (fora?) that I go to. That's why I believe it's probably universal. I believe that it's universal and that it has to occur because people are...well... people... and have strong opinions and strong disagreements with one another. And, as the old saw goes, "Give me two Jews and I'll give you three opinions." Just look at the contention between the Ultra Orthodox and the Secular Jews. Or the Conservatives and the Liberals. It never ends.