I also really, really want to insult Mizora in that scene. I agree that it is bizarre that you can insult the companions when they proposition you, but not your ally's enemy.
I don't need her to have voiced responses, maybe she could scoff in response or something. I would love to be able to mock her for thinking she was worth betraying Wyll OR Karlach OR a romanced character for, let alone all three. I would also love to be able to angrily gossip about her failed seduction attempt with those three afterwards, but that doesn't seem feasible without new voice acted lines. I want to be able to be mean, to point out that Zariel didn't think she was worth saving from the Absolute, that she's like a less powerful and less interesting version of Raphael, that sort of thing.