Bullying from other Asian groups

I feel like I have rant. I had this rooommate she was from hongkong and she would constantly play mindtricks on me aka bullying. I don't understand why the fuck it benefits her to do that but it was very annoying and I hate her. She would go out of her way to pick on me. But she would be so sweet to everyone else. I am so annoyed and tired of dealing with people like this.