Both male and females attribute a woman’s extra bitchiness to their time of the month (clue: it’s red). Women rely on this as an excuse or as a ‘reasonable’ explanation for their unreasonable actions. Boys/men (whichever category you really fall into) use it as a supporting reason for our extra bitchiness.
Yes, our hormones may be triggered by the smallest of things or our anger maybe more than usual because of our little red sea. However, it is natural for anyone to be annoyed/angry/infuriated (and, or, or progresses in such order.) at responsibilities not met, or promises not kept (aka Asa ka na gagawin niya talaga kahit na he/she said so). They trigger a naturally negative response–only for our periods to amplify.