I completely agree with you. I see in game often when people start a disagreement and it goes off topic until they start insulting each other. They started discussing, now practically ripping each others hair out. I don't understand.
I've seen in game, one person beginning a conversation, with their friend. And another person decides to join in their conversation, seeing that they have the same interests with them. This person completely goes off on one because they butted in, causing an unneeded argument.
As in your statement, these sorts of arguments do not know what they are arguing for or to prove. Which makes me think, what's the point. I usually just walk away from these petty threats if one involves me. But if there is no point to prove, there is no need.
Also, many people get upset/annoyed when somebody speaks their opinion. This irritates me a little, I mean. Can't we have our opinions? I don't like to voice my opinion in such 'rude' ways. Because this can be caused, yes they're having an opinion. But some use that as an advantage.
But yes, I do agree with you.