That they are fictions does not make them devoid of real-world references, meanings, or implications.
Fictions are full of symbolism. Fictions have meaning. Fictions are a large part of how we communicate our culture and values to each other.
Frodo Baggins isn't "just a fiction," with no relation to anything in the real world! He and Samwise Gamgee are stand-ins for Tolkien's ideal of the English country folk. Unassuming, not terribly sophisticated, but with an unmatched strength in the cores of their being that make them the overall heroes of the story!
Harper Lee's, To Kill a Mockingbird is fiction, with some very direct things to say about racial inequality. Do you wish to deny its power?
Given how we use fiction, and what we take from fiction, you cannot just assert "it is a fiction" to deflect criticism.