Now he lived in a more sexist culture than we do, so maybe that has something to do with it?
This is how he is characterized:
> known for his [...], sexism along with generous support for women academicians
But to answer the question, the reason for this to not make it taboo is simple - it is part of history and world. When you make it taboo, people end up having naive simplistic ideas over how world worked back then.
For what it's worth, I think it's clear that Feynman was, at the very least, what-we-nowadays-tend-to-call-sexist. That is, he saw women as sex objects and talked about them as sex objects, and so far as I can tell saw nothing wrong or improper about doing that. See, e.g., That Chapter of "Surely you're joking...", a bit of which is quoted in the article. (The article's decontextualization makes it look worse than it actually is, but it's still not great.) It's harder to tell whether he was sexist in the narrower sense of thinking that women are generally e.g. intellectually inferior to men. I'm pretty sure he wasn't sexist in the even narrower sense of thinking that women simply can't do the things that traditionally used to be men's jobs.
[1] Making a guess on the basis of username.
> I'm pretty sure he wasn't sexist in the even narrower sense of thinking that women simply can't do the things that traditionally used to be men's jobs
I think that part is addressed by "generous support for women academicians", support he gave to his sister and "unwavering respect for the many talented women he supported" and "support to the Blake scholar Jenijoy La Belle" all in the article.
The article basically goes out of way to point out instances where he was supportive to women with ambitions.
Offtopic: To me personally, mentioned negative attitudes mostly spoken to having certain sense of entitlement or naivety around bar women. He kind of expected them to be different species. The one where a girl falls in love with dude she just met and will have sex cause the guy she knows for 10 minutes is so awesome. Obviously it does not work like that, leading to disappointment and resentment over having to basically pay for sex.
To be clear: I see more sexism in the Los Alamos chapter,where a 'Girl' is only good enough to do computations, until the computer replaces them.
While the bar-chapters quoted here paint a bleak picture, it does so of both sexes, and Feynman remarks how things didn't work as he wasbrought up to expect.
I am indeed male,even if 'hyperman' was a happy artefact of an algorithm that shortened my 4 word full name to 8 characters to create a student logon name. My classmates liked it and it stuck