Earlier quoted context omitted.
You cut off the quote. Why? Here is the rest: "On the other hand, he is the only one who ever explained quantum mechanics to me as if I could understand it." That was the essence of Richard's charm.
Because I do not want his charm to detract from the rest of it. (charisma > sexism) == wrong. Also, in my opinion, it is actually a bit sad that the lady says, "oh well, it's ok to be treated that way because he's a good teacher". This is exactly the kind of compromise that victims make too often. Bill Clinton was not even being sexist and he got tasered big time. I'm not sure why Feynman should get a pass.
Other people may have been more polite than Feynman in casual situations, but when it came to serious discussion he treated women (and students) as equals better than other people.