The LARPing and delusion is really hard to read, (it's beyond standard cringe at this point) but his concepts of right and wrong are interesting. If anything, he has grown up a lot. He understands that he has to take responsibility for his Mom's survival in living without him rather than feed his compulsive buying of innane shit that comforts him, which is well beyond where I thought he was. Disconnection from some of his obsessions seems to be doing him well. It sounds like he is playing up to his situation a fair bit ("please show people this and send money to my home please, I'm Jesus and also mentally ill") which isn't too foreign for him, especially for attention. (namely female attention) He actually has more opportunities to make positive changes in his life if he is open to changing his obsessions to helpful things.
Either way, this is far beyond autistic rage and /v/ memes. I don't know of the scope of his awareness of how serious this shit is, but it's obvious he needs to be away from Barb. This is harsh, but I think her no longer being alive will improve his life drastically. It seems like this is the only way he'll be able to fully separate from the womb, so to speak.