The most paranoid fans in the world are without doubt celtic fans. No set of fans come close.
I'd say both of the old firm teams equally. Both think the refs are out to get them.
I work alongside a tim and my best mate is a tim, I have many good friends that are bears and I can say that the tims are more paranoid than the bears. It is not even close. They are also very bad losers. Yeasterday was quite funny listening to them