[ She shouldn't be mad about his being alarmed, she sure was when her thirst first struck her -- but she still feels a rising tide of anger when he speaks about self-proclaimed vampires and growing out of it ]

I can't speak for your unitmate, but this isn't something I could change. It's what I am. If your unitmate is pretending for whatever reason, have you tried thinking about why they might want to do that? [ She has distaste about someone trying to wear vampirism like a costume, but she has more distaste about someone being judged for being who they are. ]