When I read online sites where Asian Caucasians dominate (Indians and Pakistanis, sometimes Arabs or Iranians) I notice that one of the recurring comebacks is to tell the interlocutor to go and educate himself because he lacks knowledge. Not something you regularly hear among Euros as the first out of the box move.
On Jewish blogs, people tend to argue in paragraphs.
Watching yet one more Ebonic brawl video (dailykenn.com provides them for your cultural edification, along with a regular listing of diversity crimes), I note three recurring patterns: First, the protest that "You don't know me! You don't know anything about me!" This is unique to Africans In America as far as I know. I have heard it quite often in these situations. Second, the choice of a fighting mantra which is repeated over and over and over, as in "You don't know shit!" shouted without pause during the whole tete-a-tete. And in the age of the smart phone, those taking the pictures --often males who watch groups of female in battle-- can be heard to repeat, over and over, "Oooooo! Oh, shit! Oh, shit." in a voice the expresses --to my Caucasoid ears-- both insincerely theatrical shock and guilty but genuine pleasure.
The vast majority of comments online, regardless of race or religion, either miss the point (which the commentor never intended to hear in the first place) or change the subject or do personal attacks and name-calling.
One phenomenon I note especially in UK sites where religion is involved is that large numbers of atheist trolls drop in to repeat their phrases about imaginary friends, desert gods and bronze age fairy tales.
A priest who taught me in high school said that if there was intelligent life outside our solar system, they would never come to earth because they would be advanced enough to intercept and see our television programs.
With the internet, we are probably ten times safer.
It really is the mosh pit of the planet.