Earlier quoted context omitted.
Kind of negates the whole "I'm not a sexist" take on the situation. If you're going to write about how much of a chivalrous guy you are, you should probably also be more careful with the way you describe the thin skirts that you like so much. I agree with you. If someone (male or female) were writing about an interaction with the genders reversed, you probably wouldn't hear anything about how good-looking the guy was…
The outer appearance of the two people interacting are descried. There is even a picture illustrating how the man looked like. How this is sexism against the woman is beyond me. How this is sexism at all. This seems to be a feminist keen-jerk reaction. Outer appearance of a somebody? That somebody happens to be a woman? What a misogynist!
Our culture is sexist, and all of us are (in daily practice) to some degree. With women, there's a strong focus on their attractiveness that doesn't exist for men. For just one example relative to this society (not OP) people don't infer radically different personalities for men based on attractiveness (except, perhaps, for the top and bottom couple of percent) but they do for women.
Yes, I think that, based on the totality of the OP, there's a latent sexism in the way the encounter was presented.