He says: Is it your time of the month? Maybe you should have taken a personal day…”
Your handbook calls it: Rude treatment of women because of gender
She calls it: OH, HELL NO
Why you're wrong: Haven't spent much time around women, huh? Though you may have intended this to be a sympathetic nod to her fluctuating hormones, she'll interpret it as a sexist insult of the highest order (because it is). You saying her inability to control her unruly hormones is getting in the way of her work is akin to her asking if your blue balls are getting in the way of your productivity. Although, if you're saying shit like this, they probably are.