I believe strongly in equal rights for both genders-but exactly equal. No special favors, no special treatment, no monthly excuse for bad behavior. Men don't get those, so that can hardly be asserted as an "equal" right. It's not "misogynist" to think people of any gender should be held equally accountable for their decisions and behavior.
No, it's misogynistic to ignore biology and claim that accepting it is "special treatment." Do you think that women who have pre-menstrual problems enjoy them? Many women do go on birth control specifically to avoid those problems! But to say, as the grandparent did, that ANY woman who has this problem and is not fixing with through HBC is "negligent" is to completely ignore the fact that for some women it is not treatable or the treatment is worse for them than the condition.
Why is the male experience the default that women must try to match in your scenario? I would say that it's special fucking treatment for a man to expect the women in his life to ignore hormonal problems that he will never have to experience or try to ignore so that they can live up to his ideal. Why does he deserve for her to do that when he will never do it for her?
Yes, there are probably women out there who use their periods as an excuse to act extra bitchy when they don't really need to. Just like there are men who use their wives' premenstrual touchiness as an excuse to cheat on her. Both are examples of unethical behavior. But if you really think that that's the norm instead of an anomaly, you should just go say a little prayer, or thank your lucky stars, or whatever you do that you will never experience the hormonal hell that many women have to deal with on a regular basis. Be glad things aren't equal in that regard.