He thinks because I'm in front the computer many hours per day that my thoughts aren't entirely independent or my own. Well, sure, I can theorize the same, but not for the same reasons!
I told you all he's fearful, insecure, and has neurotic tendencies and anxieties ... this is how they manifest.
Schizophrenia typically manifests around age 30's. I don't think he's schizophrenic. I guess it's possible though. Unless he starts acting on these thoughts, I guess I'll just call him eccentric.