So it is just used as an excuse to let out bottled up bitchiness?
lemme break it down a bit
so periods are pretty miserable ok. horrid cramps, skin breakouts and excess oil, feeling bloated but super hungry and thirsty at the same time, mood swings, headaches, and the fact that you're bleeding, etc etc (it varies ok). it all combines to make for a pretty bad time (i for one can get easily frustrated, cramps so bad that i can't walk, bloating and awful spine pain, feeling gross all the time and wanting to eat everything). yes us women can be easily upset when on our periods (some worse than others; i often feel like i want to strangle anyone and everyone for like day or two) but it by no means makes all of us totally irrational. we fully understand that nearly biting someone's head off with the excuse of "i'm on my period" is pretty stuffty and we therefore understand that we're expected to keep our mood swings and anger in check.
tbh it gets p annoying when everyone says "oh she's on her period" whenever a female gets mad at something, cuz we can get mad regardless of whether or not we're on our period.