I think Dave is suffering from a mental breakdown.
He’s clearly very angry and is targeting the type of white people he seems to have mostly associated with in his life. And as you say, there’s a reason a person would associate with that type.
He’s had some tough times, being fired from Takimag and having to sell his house, which he inherited from his mother, and is now living off the proceeds, unable to sell his writing or find other employment.
He’s a chronic alcoholic and as a result has serious health issues. I told him his immune system was compromised a couple of years ago when he was bitten on his legs by mosquitos and exhibited classic Skeeter Syndrome symptoms, and not long after he had to go to the emergency hospital because a small cut in his mouth became badly infected. He also has suffered from gout which is probably related to his immune system’s weakness. And has high blood pressure.
He spends a lot of time on Twitter arguing with trolls and creeps and he thinks the world is full of such people when all he has to do is log off, forget them and take a walk, chat with actual people, do some self-examination and redirect his life. And quit drinking.
He could have a great future ahead if he would get a grip. I know that’s easy to say, but you always have to fight back against the darkness inside your own head. Dave’s a great raconteur with plenty of stories to tell. He could have a podcast or vlog here and ought to be able to do as well as someone like Linh Dinh, another talented but troubled soul who also has had his writing career destroyed, and probably as well as Steve Sailer.