May have been the 50s but it is Hitchcock you are talking about. The guy was very much into modernism, including stuff like women's libs, Freudian understanding of human nature and so forth. Clever director, but most certainly a degenerate and among the architects of the society we have now and that scene probably came a shock to audiences back then.
BTW, here a very good example of what i'm talking about:
Freudian science didn't discover the black pill,
they brought it into existence in the first place. While there's definitely an underlying "darker" aspect to human nature it does NOT dominate human beings as much as the Freudian people claim it does, THEY were the ones responsible for elevating it to the degree we see today, through their propaganda, their brainwashing, both in the media and in the culture, their spreading of vices under the banner of liberation etc.
Women act the way they do because the Freudian people gave people a license to indulge in their worst and most depraved innermost desires, desires which in previous societies were suppressed and frowned upon. It is part of the female psyche to ignore morality for the sake of her desires but in a traditional society acting out on that impulse so liberally and blatantly as in that Hitchcock scene would have brought massive amount of social shame. Not anymore though.