Friend makes me wanna cry

So I have this friend, actually she's like my bff and I love her to death but whenever we get in an argument it's always her trying to overthrow me like the other day I referred to her room as small (because it is like mine) and she like flipped out she was like "my room is small my room is bigger than yours." In this really sarcastic laughy voice that annoys the crap out of me, so I said "I wasn't trying to be rude my room is smaller I know and it's okay but I was saying we don't have like huge rooms" and she started like nagging and nagging into the argument and I was still calm and then she said to my other friend and said "see she gets so defensive and so mad" (but really that's actually her) and I would tell her that every time we get in an argument like this but then she always says I am when I am truly not. But the worst thing is that my other friend that was there started laughing and started nagging me to saying "yea she does get really mad easily" LIKE JESUS CHRIST IM NOT MAD UNTIL YOU SAY IM MAD. THEN IM MAD😭😭😭