AITAH for refusing to cut my hair for my sister's graduation?
My (26M) sister (22F) is graduating from undergrad this weekend. We both currently live at home with both of our parents. My mother (56F) told me about a week ago that I needed to get a haircut before my sister's graduation because "my sister wanted me to look nice".
My hair is rather long and I haven't gotten a trim or anything in about six months. Since I started growing it out I've been complimented on my hair a lot more often, including as recently as this month. I am not very attractive so getting compliments from complete strangers has been a big confidence boost. My mother has previously thrown a fit about my refusal to get a trim, because I like the natural shaggy look of my hair and she doesn't. When my mother cuts my hair she styles it so that it's slicked back like I'm some greasy Italian mobster (minus the grease because I have a dry scalp). I don't really get split ends so it's not particularly necessary for my hair's health either.
I talked to my sister about all of this and she said that she didn't actually care if I got a haircut or not. My mother completely made up the bit about my sister wanting me to get a trim. I confronted my mother about this and she shut me down, saying "I need to talk to your sister". She then apparently argued with my sister about it so much that she wore her down and my sister texted me "Just get the haircut, I don't want to deal with these arguments on my day."
I told my mother that I still didn't want to get a haircut, and in retaliation she's barred me from going to my sister's graduation. I have no transportation of my own and would've needed to order a temporary parking pass already anyway, so I can't circumvent this.
My mother has been commenting on how shitty it is of me to refuse to do something so simple for my sister, but I feel like my body is not something she or anyone else is allowed to dictate for any reason or occasion. On the other hand, it would require no real effort on my part to just get the haircut and be done with it. AITAH?
UPDATE: My mother woke me up this morning (day of the graduation) to tell me to get ready to go, so I guess I out-stubborned her. She is still complaining about my hair but it's not a problem anymore ¯\_(ツ)_/¯