Grandma Relationship Problems.....HELP!?

So my grandma is coming to stay at my parents house so that means I'll have to be her ideal of a perfection granddaughter and I HATE HER! and she hates me and I know it! And don't come to me with "You spoiled brat dont say such things" and I know she hates me because she called me a slut once in front of my mom.Not to mention that shes really old fashion and shes mexican so she said "Look at your daughter shes dressed like a slut" in spanish and then after that she called me a "perra" which means b*tch in spanish.She thinks I'm a slut because she doesnt like the way I dress and I wear skinny jeans,converse and a simple t-shirt that covers EVERYTHING and it DOES NOT show anything inapropriette.When my mom was my age she wouldnt permit my mom to dress in leggings and a shirt that covers till her knees.Plus when i was 9 I started taking karate right? then in one of my compititions she was out in the stands and I was like "I'm going to try my best to impress her" and when I was done I found out that she was GONE! and I asked my mother where she went and my mom said my dad took her home because she was bored and my dad was really the only person who encouraged me to continue karate when it got tough and my mom didnt even bother looking because she was always afraid I would get hurt.So no one was there for me because of HER. Plus outta the other 13 cousins of mine she had to pick me to hate on just because I'm different and I like doing what I love and I have an older cousin who is one yr older than me and my grandma loves her because shes her ideal perfection of a person.She has done other worst things then just what I've just told you.Now that I'm still "different" and I'm into dance now and still into art(once she also tore up a piece of art of mine I gave her and I ended up crying) I just don't want to fake a person I'm not cause I've been doing it all my life and I feel like I'm trapped inside a box when I act like a person I'm not.What should I do? Should I continue my act of someone i'm not? and dont just say yes or no, explain y