So a millennia-old spirit is an expert on genetics, now? [Wanda has no problem believing in magic, or spirits, or Jack Frost himself. She does have a HUGE problem with people claiming there's no such thing as an X-Gene in their world, though.] Can you even hold a book to read? Have you ever even managed to convince a geneticist that you existed for long enough to hold a conversation with them? Who do you think you ARE to make a claim like that?

[Well, Jack found someone who can believe in him. He also struck one heckuva nerve.]