I have lived with members of the opposite sex every year of my life so far. Some things never seem to change. I don't know whether it is hormonal or what, but in every house with more than one woman there will be some kind of pointless fight between them. There is no way you can intervene in these bouts and they are all completely unnecessary.
Sometimes I wonder if it is just alpha female syndrome. This used to happen a lot at home between my sisters and my mum. I can never quite understand how the arguments start but they sure take a while to end. But the way it happened always reminded me of the way animals fight each other to take dominance over the group. If it hasn't happened yet in your family home I can guarantee it will when someone turns 18.
With housemates, I find that the arguments are normally just pointless spats for no apparent reason, or an overreaction to something that has happened. Then, once they have fallen out they just end up going at each other with the sole purpose to aggravate them. Like why don't you want to just be friends again? Why do you have to making things worse?
My male housemate and I have both noticed this and decided it is most definitely a girl thing. Call us sexist if you must but we are speaking from experience here (he also has a sister). We normally just stay out of it because we'd rather be friends with everyone than have to get involved in such a pointless debate.
You'll probably hate me for this post but quite honestly, I am sick and tired of all the arguments that start due to stupid things. If anyone knows how to stop the fighting please comment/message.