“everyone recognizes that string theory is currently untestable and un-falsifiable and then they get upset when this untestable, un-falsifiable theory claims that we are living in a universe that can’t exist”
Isn’t that, in a way, a falsification? If your theory can describe a multitude of universes, but not the one we actually live in, then your theory is falsified as a description of the only universe that matters to us, no?
Good point. I wish I would have thought of that.