Maybe she picks up on his skepticism or maybe she just knows how she sounds to people who don't live in Metropolis and so she hurries to defend herself. "Yes, but not everyone. It's not an entirely common thing where I am from."

A drink of her wine (really, she should probably stop that) and she sets the glass aside on the coffee table, getting ready to stand.

"I could show you, if you'd like." Not that she has any really wild and cool powers (comparatively speaking.)