That's not a problem at all! The way I'm looking at it is, those comics? Were kinda like the pirate comics in Watchmen. You don't need to know the backstory of the guy adrift at sea, he's adrift at sea and what will happen next?

So as far as Stiles is concerned, backstories and secret identities weren't covered in his comics that he read. It was enough that Batman and Superman were out fighting the Joker and Mxyzptlk.