I was going to post a response to this arguing that it isn't really culture jamming, but I'm not 100% sure.

A great deal of 4chan "schizoposting" reads (to me) like normal shitposting mixed with with the "chaotic energy" of actual sufferers of schizophrenia, like Terry Davis. There's also an incel/"NPC" element, where people suffering from extreme isolation de-realize the others around them to rationalize their perceived harms. Mixed together, it's less "dis-communication" or culture jamming and more a confused complex of digital alienation. But maybe that's just alienation under capitalism, and brings us right back to culture jamming.