1. Rejecting someone because of his physical appearence is discrimination and can lead long-term to a genocide of an entire group of people (in this case, incels). Depending on the foid you're talking to, you can compare women treatments of incels like Nazis with the Jews (if she's a kike), Whites with Blacks during african colonization (if she's black), Putin with ukrainians (if she's ukrainian), Jews with Gaza (if she's arab), etc. Always adapt the argument to your opponent to make it closer to her personal feelings.
2. You're mocking a group of people based on characteristics they can't change, meaning you're acting like a bully, and acting like a bully makes you a bad person (if you feel she's religious, add that she'll burn to hell if she behaves like that).
Idk if it's helpful, I never argue with foids about inceldom since it's pointless
