It's quite simple really, Djokovic is contender in every tournament he enters, Nadal is contender only in the clay season, it's not megalomania, it's a realistic expectations that he will win something based on his quality and versatility on every surface out there. Nadal otoh doesn't have that luxury, he rarely wins something off clay and he needs a specific conditions (depleted field, kind draw) for that to happen, that's why your fanbase is extra loud only around the Clay season. Simple as that really.
This whole Bullzillion disconnection with the reality is a quite extraordinary, I have to say.