While I’m not a psychologist, I read far too much crap online, so take this as a layman’s view.
There’s been a lot of research around the dopamine feedback loop around social media, as well as the fact that arguing and “winning” is a major dopamine hit, so I wouldn’t be the least bit shocked that a lot of the more toxic people are literally addicted to the dopamine that social networks give you that they’re arguing and posting for no other reason than their next hit.
I guess the real question, ultimately, is how do you deprogram the worst elements of this cohort so that they can like… respond and converse like a normal human without having to argue every single thing and go on and on and on until they “win”? (Which, IMO, means the other person has just gotten tired of dealing with them more than anything else.)
I will happily admit I have absolutely no idea, and will also admit that I have on more than one occasion been That Guy Posting but I really really try to not let myself be.