Is AUTHOR wrong in the post ? POST : AITA for trying to understand my hard of hearing mom?

So This happened when I came home. I had Band practice and I did not know if he wanted us to stay later to practice so in the morning when she asked if I wanted to go I said no about 3 times. I get home and my mom (a little hard hearing) comes to me and says to have a shower before we go to the haircutters. I say that I have a lot of homework and I can't go tonight. She says that she has a coupon for $3 off and I again say no. She then gets mad at me and starts to yell about she waited all day just for me to say no and how they may accept the coupon later. I ask her to say that again and she tells me that she said it before how it expires today. I say then ok we can go but she instead gets mad and says forget it and rips the coupon up and storms out the door. AITA?

&amp;#x200B;

Will provide more info if needed.