There's actually considerable overlap in the delusional qualities of schizophrenics and those with Paranoid Personality Disorder. Speaking of the latter, here is a list of some of their characteristics:

• Doubt the commitment, loyalty, or trustworthiness of others, believing others are exploiting or deceiving them.
• Are unforgiving and hold grudges.
• Are hypersensitive and take criticism poorly.
• Read hidden meanings in the innocent remarks or casual looks of others.
• Perceive attacks on their character that are not apparent to others; they generally react with anger and are quick to retaliate.
• Cannot see their role in problems or conflicts, believing they are always right.
• Have difficulty relaxing.
• Are hostile, stubborn, and argumentative.

It's almost like 90% of somebody's presence on this forum (won't say who) is guided by a pathological state of mind.