Frankly I think it's ironic you're accusing me of "Curtians are just blue" type shit when that's precisely what I think you and all the other "Frieren is racist" leftists are doing

The "blue curtains" reading would be "the demons don't represent anything, it's just a story." We're not doing that. We're describing how certain elements in the story facilitate a symbolic interpretation that differs from yours.

what the Demons are supposed to represent

Death of the author, what they're "supposed" to represent is irrelevant, we're judging the work by what is present within it and the cultural and historical context within which it exists.