Here's a terrific quote from that terrific musical:
Mrs. Higgins: However did you learn good manners with my son around?
Eliza Doolittle: It was very difficult. I should never have known how ladies and gentlemen really behaved, if it hadn't been for Colonel Pickering. He always showed what he thought and felt about me as if I were something better than a common flower girl. You see, Mrs. Higgins, apart from the things one can pick up, the difference between a lady and a flower girl is not how she behaves, but how she is treated. I shall always be a common flower girl to Professor Higgins, because he always treats me like a common flower girl, and always will. But I know that I shall always be a lady to Colonel Pickering, because he always treats me like a lady, and always will.
Professor Henry Higgins: The question is not whether I've treated you rudely but whether you've ever heard me treat anyone else better.