why aren't you someone else?

At a reading a man asked why I don’t write YA books and I said that I couldn’t because kids scrutinize you and I wasn’t up to it. Which was so phony. I had read that someplace. Really I didn’t know what to say. I was vaguely aware that he was being sarcastic, and told him the first thing that came to me. Why don't you write YA books? It was like being asked why don't you write westerns or why aren't you a poet. If you see what I mean.