It's unfair and uncalled for to refer to all fans as delusional... Fanaticism defies logic to favour idolisation, it's called being a fan.
Not all fans are like that either... you can have very diverse discussions with plenty of brilliant fans that understand the logic of fanaticism.
EDIT: Typographical error.
Most think BIG is the undisputed #1 and miles above everyone else when in reality every top 10 team is as good and they could easily lose to any top 10 team in any given match. They are not dominating, they are just barely #1