Okay, I've read the whole article. His dad was a drug addict who is now dead. It sucks to have a bad parent. And his mother is disabled and can't really help him. I see now where all the disgruntlement and negativity comes from. And why it is so hard for him to live a life. It's always is hard when one (or in an even worse case both) of your parents are bad. Not only such parents do not pass over their knowledge of life and wealth to their children, they actually take from them. This really sucks, I'm sorry. The man is living this life on a higher difficulty. I feel for him.
I'm feeling similar. Shitty people who are supposed to be your caretakers permanently reduce the brain cycles needed for other things. The damage is a lifelong condition, like diabetes or cancer. Everything that's their fault in an unrelated timeframe becomes your fault when the causal link isn't obvious enough to outsiders. They just assume you should know better because you passed an arbitrary age. Interpersonal relationships suffer (I empathize with the lack of a professional network). It drives desperation and cynicism.
Responders are going to address the lack of job success. The advice is good and actionable. But sometimes no one "normal" (non-therapeutic/paid for) is there to listen to you and the urge to get things off one's chest becomes unbearable. Like the urge becomes so strong you just have to scream it to the world to get relief from anxiety. The negativity is the inevitable result, and it's understandable. It's catharsis and a need being fulfilled. I hope things turn out alright for him.