I mean I hope you're not offended by my willingness to actually respond. I take this seriously, because I really truly don't think there should be such a divide. We shouldn't need to be afraid of each other.
>What is the difference between someone pretending to know what they're talking about and someone who actually does?
Someone who pretends to know what they're talking about uses words in an inconsistent manner, and can't rephrase their meaning very well if asked to do so. Someone who can actually rephrase themselves and explain something multiple different ways likely at least understands what they're talking about on a conceptual level.
As far as I can tell, both boards have people who fall into both the former and latter categories. So not a difference between boards there, as far as you have currently presented your opinion.
>What is the difference between gibberish and coherence?
Gibberish can be automatically generated, ie., by a machine algorithm. It's hard to read, even if you have "practice" reading gibberish, and won't make much sense, if any, on further analysis. Coherent dialogue actually involves interaction, learning to see the other user's message, and responding in kind with your own stance.
On this point you can, legitimately, I willingly admit, claim that there is a distinct difference between boards. But even then, /x/ anons don't much like seeing word salad either, and we even have a name for it precisely because we want to rid ourselves of the meme.
>What is the difference between mental illness and sanity?
Not much, as far as we can tell. (Or as far as I can tell, I won't pretend to be a representative sample of /x/ users.)
That's why I'm asking; I don't get why so many from /x/ get dismissed as loons or Schizos. What, ultimately, makes up the difference? Help me understand, if there is any real understanding to be had and it's not just wrong assumptions about each other on both sides of the fence.