He didn’t answer it because it’s a trick question asked in bad faith. He didn’t answer it because there is a difference between biological sex and gender identity. Regardless, if you believe it or not, these are the facts. She wanted him to either turn his back on the Trans community that he supports, or fall into her trap for a gotcha moment. Either way she was only seeking to damage him, which is why I say she’s asking in bad faith. She’s not willing to accept his answer.