Except that it's actual nonsense. Not long after WW2 the congress tried to ban comic books for spoiling the youth,just couple decades later people were holding public protests against the Simpsons, and the first TV show to mention the word "period" was met with similar level of protests as if that's something dirty and unspeakable.
No, it's the exact opposite - "back then" people were far more fragile and sensitive and doing or saying the wrong kind of thing could have serious consequences on your life.