How does Higgins respond when Liza says the following?

"Aha! Now I know how to deal with you. What a fool I was not to think of it before! You can't take away the knowledge you gave me. You said I had a finer ear than you. And I can be civil and kind to people, which is more than you can. Aha! That's done you, Henry Higgins, it has. Now I don't care that [snapping her fingers] for your bullying and your big talk. I'll advertize it in the papers that your duchess is only a flower girl that you taught, and that she'll teach anybody to be a duchess just the same in six months for a thousand guineas. Oh, when I think of myself crawling under your feet and being trampled on and called names, when all the time I had only to lift up my finger to be as good as you, I could just kick myself."