I USED TO BE AN ELBOW MODEL

I went to dinner yesterday with someone I worked on a side project with. She has a rather high opinion of herself. She says things like, "She hated me because I'm a cute blond" and "I was smarter than all of them so...". I sat at the table hearing her compliment herself over and over and over and I began to daydream about the large light fixture above her head falling and ending this madness.

Then I heard her say, "I think if we met outside of working on this project, we would have become good friends anyway." What? Did I hear that right? I don't even like you!

It just made me wonder. How many times did I meet someone and really like them and they didn't like me? How many people envisioned a light fixture falling on MY head? Am I being phony for chuckling at her stupid jokes and nodding in agreement with statements I totally disagree with? What is the line between being phony and being respectful or courteous?