That comment is from the post, which again, I'd suggest people read instead of a paraphrase.
This is the advice offered to him:
“Therefore,” he continued, “under no circumstances be a gentleman! You must disrespect the girls. Furthermore, the very first rule is, don’t buy a girl anything –– not even a package of cigarettes — until you’ve asked her if she’ll sleep with you, and you’re convinced that she will, and that she’s not lying.”
The master of ceremonies was right, as in: acting disagreeable, pushy, socially superior, insulting, etc., and then directly propositioning someone for sex before paying for anything was effective in practice (at least twice) at getting women at a bar to agree to a one-night stand.
Edit: I read “the post”. Either the author has poor reading comprehension and largely failed to understand the content of the story (maybe Feynman can be blamed for not having written it in a clearer way), or she is being disingenuous.
I think the right phrase here might have passed out of our vocabulary during a long recent period of extreme permissiveness. It's ungentlemanlike to speak of such things.
This is the advice offered to him:
“Therefore,” he continued, “under no circumstances be a gentleman! You must disrespect the girls. Furthermore, the very first rule is, don’t buy a girl anything –– not even a package of cigarettes — until you’ve asked her if she’ll sleep with you, and you’re convinced that she will, and that she’s not lying.”
This is his conclusion to that advice:
The master was right. So the lesson was terrific!
You can take from it whatever you want.