Why does my roommate hate me so much?

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Why does my roommate hate me so much?
We are two completely different people. She parties all the time, drinks, smokes weed, and hooks up with lots of guys. Her friends are trashy and so is she. She's ugly on the inside and the outside. She's so judgmental. Her stuff is messy and disgusting. She vents about me on her twitter but she won't say it to my face. I don't want to watch this stupid show, why is she watching it? and you see me studying and you come in and turn on the tv, why is she so rude? She also says Its hard for her to check herself out when I'm always in the room. I have friends and I'm only in the room during the evening. I mean I'm paying plenty for this dorm.

-How am I supposed to know she's studying, I'm not psychic. It's my TV, I can watch whatever I want.

On the other hand, I'm very quiet, I don't drink, I go out sometimes, I study a lot, and I don't mess around with guys. If something is bothering me, I keep it to myself. I'm nice and caring.

My roommate is never in the room. She can't stand being around me. I LOVE IT!! I don't say anything to her when she is in the room. She comes in the room at 4 in the morning every night from hanging out with friends even though she has 8 a.m.

Why does she dislike me? I don't care I find it amusing. I haven't done anything.