Ian grabs Lili as she tries to leave.
Lili: Let go of me, you sociopath.
Ian: You think I'm a sociopath?
Ian smiles as if it is/were a compliment.
It should be 'were', right? Even though the sentence is written in the present tense?
Is the sentence written in a perfectly natural way? Could it also be: Ian smiles as were it a compliment.