From Shakespeare's Hamlet 1602:
Heaven and earth,
Must I remember? Why, she would hang on him
As if increase of appetite had grown
By what it fed on, and yet, within a month—
Let me not think on't—Frailty, thy name is woman!—
Hamlet is angry at his mother for marrying shortly after his father's death. He sees her as weak. He generalizes the weakness he sees in his mother to women generally.
No progressive manager would say a sexist comment like that today. Actually, they might, just when they think they are...