over exaggerated PMS

I HATE when girls excuse there behavior on PMS. You don't get to act like a absolute piece of shit human then say "sorry I'm pmsing". how is it I can act totally okay and feel like I have a normal emotions, but you're being a cunt? like no. be kind to people no matter what. if you're in pain its totally fine to be grumpy and ask for space or whatever but don't blame everything on your period, you're still in charge of your emotions and actions.