i'll probably repeat what you said but with different words :P

The number one way to communicate with each other is internet and because as you say we all have our avatars, alter egos and it's a bit harder for anyone to actually meet in real life, we have way too many trolls that can't even argue to something and disagree with everything.

This is one of the simplest things in psychology. They just wanna defend themselves because they feel like they are losing and they will say whatever it comes to their brains in order to do so.

The key here when we debate with someone is arguments and respect the others opinion. If it's wrong we gonna try and make him understand it through arguments, if he doesn't we gonna end the conversation or change the subject.

If the people that are in that debate respect each other and actually have the will to learn even if they don't make up their minds at that moment, later they will try and search it on their own, thus progress will be made!