I have to STRONGLY agree with Nydanna and Minibit...and STRONGLY disagree with anyone who says that children's realities will be warped.
Assuming the average child with the average mental capability, then no, I feel there is no "false sense of reality" into which children will immerse themselves. As adults we have a tendency to belittle the ability of a child's understanding. We assume that children are incredibly naive to the point they are gullible.
These kids are just that: naive, but not gullible. They have yet to experience the world in capacity that we have and are still understanding the way the world works. (Hell, I'm 21, I still don't know how the world works and I'm still probably more "naive, gullible, and impressionable" then most children.) Through fairy tales, I feel they are INTRODUCED to various cultural morals and concepts. I don't necessarily believe that they consider these morals as fact because children realize these are just some more "make-believe" stories, just in movie form.
The morals in these fairy tales will not be ingrained (indelibly rooted), but instilled (introduction through persistent efforts) into children's minds. Throughout this instilling process, children will DEFINITELY ask questions. Kids ALWAYS ask questions and wonder and think and imagine and conjure up other possibilities in their hard-working brains. Then they'll discover things and form their own opinions, even at such an early age. These opinions might even go against the norm.
I used to know a liiiiittleeee kid who hated watching Cinderella because "she wasn't able to stand up to mean people by herself." That same little kid doesn't like Sleeping Beauty because "why do the boys always save the girls? Why can't the girls save the boys?"
For me, I feel like fairy tales act almost like accelerants to kindle curiosity. Children, like any normal human being, are different. Some will take the fairy tale at face value and accept the facts laid before them. Some will ask questions and not like certain stories.
But, however, if you limit and simplify any person's way of thinking, then they will not form their own opinions. If you tell a girl that "boys always save the girls because the girls are weak," then she may take it as fact. If you tell a boy that "boys never cry 'cause they need to be tough," then he may take it as fact. It is not the fairy tale that gives a false sense of reality, it's the opinions of others that give that false reality.