No not everyone. I'm simply saying that given the Oblivion crisis, people (NPCs) would be very cautious in their dealings with any daedra. Daedra and their motivations are difficult for ordinary mortals to understand, and people fear what they don't understand.
All true, though I would still love to play as a Dremora, or a male of the Mazkan or Aureal. At a distance, the latter two could probably fare better than many other Daedric Types. Until you got right up on them and noticed their eyes and just how much sheen there is to their colour, a Mazkan could slide as a very tall, very dark Dark Elf, and an Aureal could, again at a distance, get away as an Altmer. Only the well traveled, experienced, and mages would be able to identify them beyond doubt at any rate. And as such Daedra, even the Dremora, are often used as servants by mages, and even sent on errands (consider the message sent to by the Mages Guild to Hyronimus Lex in the Thieves Guild Quest), there is at least a fair chance that you would not be attacked on sight unless you started misbehaving.