I don't have to prove that individual people don't represent the entire population. Every population contains jerks. Your take away is "look this how horrible the entire gaming population of FFXIV is!" .. mine is "some people are jerks that doesn't mean they're all jerks."
Your point isn't any more salient than all those people you quoted using experiences with horrible people in a streamers fanbase to represent the entirety of the fanbase.
It's just as bad a take.
The fact you included a couple of.. well.. lets be charitable: Questionably genuine forum members, doesn't help lend any validity.