Batman and Tinkerbell

For the past few weeks we have had an ongoing discussion between a few of our four year old preschoolers about Batman and Tinkerbell.
During playtime:
Emma: Why won't you play Tinkerbell with me? I don't want to play batman!

Lane: Because batman is real and Tinkerbell isn't.

A Couple of weeks later during snack time:

Emma: Why don't you like Tinkerbell?

Lane: She is not real.

Tyler: Yeah, fairies are not real. Only the tooth fairy is real.

Emma: Batman is not real either!

Lane: Well maybe he is not real now, but someday he will be because when I grow up I'm going to be Batman.