Yes road rage is a very good analogy.
Accidentally bump into someone whilst walking and it's usually apologies on both sides.
Accidentally bump into someone whilst driving and it's can turn nasty.
Disagree with someone in a face to face discussion and it should be reasonableness all around.
Disagree with an avatar and it can turn nasty.
I think it may be different when people do know each other personally though. If you have met someone face to face and actually don't like them then I can understand that you are going to carry it over onto the computer screen. You can't like everyone after all. ( I should say ' I ' can't like everyone. There may be some who do).Which is my point on this site. Many do seem to know each other.
If they don't, then it seems very childish really to lose control arguing with someone that they don't know the age, gender, location or quantity of.
It may be different,of course, if people didn't conceal their identity.
Thanks
Thomas Covenant