I know plenty of men who lived through that era (and one man who was born 4 years after Feynman) who are not in the slightest bit sexist. Or are at least far too polite to show it.
Feynman was clearly a bit of a prick. It also appears that he behaved rudely toward women [0]. In my opinion, the fact that there were some (significant) negative aspects of his personality doesn't take anything away from what he accomplished, or from the (significant) positive aspects of his personality.
In the same way, and probably much less, that any male was in a totally different era of the 60s and 70s...