I have witnessed it - but personally, I have always been supported by other females (apart from one bi.atch, but that was personal). I have more often had to battle men who think I am just...a woman! And I have had the usual explanations to give (which I now refuse to offer). If I work fewer hours, I am a mother hen, if I work more hours, I am a bad mother. I doubt any man has ever been subjected to that stupid prejudice.