<human>: Give me the gist of the text in a nutshell

Me and my sister (Me-22, her 20) had made plans to put up christmas decorations in our living room a few days ago. She texted me during the afternoon today to confirm if we were still going to put up the tree/lights and I said yes. She texted back basically indicating that we push decorating until tomorrow night so she could see her boyfriend which I replied would be ok but difficult for me because I planned to study for my finals. She then said we could do the decorations tonight.

I got home around 5:00 and started laying out the lights and getting everything ready for when she was off at 7:00. She got home and saw everything laid out and right away started to help me. We were putting up the first lights up but I could already tell she was rushing (didn't take off her shoes, and complained I was being "OCD" about fixing the light positioning) We put up two more lights, but before finishing the third lights she ended up walking off into the kitchen to get food. She came back in to take a picture of the lights and I made a rude remark about her spending less than 10 minutes on decorations before taking a picture and posting it on instagram. She got upset and said she wasnt going to help me anymore because my snide remark and left.

So basically; Was I wrong for making a rude comment and for being irritated that she was not interested in putting up the christmas decorations? Or was she wrong for rushing our plans to put up christmas decorations to go spend time with her boyfriend?

(Additional info: Our family is quite dysfunctional normally and we had not put up christmas decorations in probably more than 3 or 4 years.)
<bot>: Me and my sister made plans to put up christmas decorations. She rushed the process because she made other plans and I got offended. I made a rude remark and she got offended and left. Opinions?