AITAH After telling my father (56m) I (16f) have plans?

So, my parents are divorced and I had to stay at my father's this long weekend (it's a local holiday where I'm from, but that doesn't really matter), and I left my keys at my mom's. Today I had to go to the florist's to order a bouquet for my teacher and arranged it to be picked up Sunday morning. Now, I took the bus back to my father's and rung so he'd open the door, only to find out he had gone to the supermarket with one of my two sisters while the other one was out shopping for graduation dresses, which meant I had to wait outside in the heat, and he got really mad when I asked why he hadn't called me to warn me no one would be home to open the door when he knew I didn't have my key. During dinner I warned him about the pickup, and he got even more mad, as he wanted to go get some shoes for my sister's graduation Sunday morning before dropping us off at our mom's, and when he asked about moving it to Saturday I said we could because I had a catechetical thing arranged that I couldn't miss (I turned catholic a few years ago, I'm receiving my first communion this May). Then he got really mad, called me a brat and dismissed me, any thoughts?