And it's not that hard to understand, it wasn't as if women would faint at hearing the word fuck, but that casual swearing made an environment feel like a boys club which used to be strongly exclusionary. Go talk to your grandmothers about it, the 60s was the start of second wave feminism— we're not talking about "they said guys to refer to a mixed group" but "how dare a skirt talk back to a man" level sexism.