using a throwaway for this because a lot of people know me on my main account

my sister (17F) and I (24M) were extremely close, and i could call her my best friend. when my sister turned 17, she started dating someone. we had no idea who it was, but she gave us pretty vivid descriptions of him. caring, nice, funny, and handsome. i was intrigued on who this might be. i went on instagram to find her boyfriend and to my horror, he was BLACK! i felt betrayed by the person that i cared about and grew up with. i went to her and with all my rage, i punched her. she yelled at me and started crying, and i explained that it was her fault and should not have lied about dating a white guy to me and our parents. she then called me a “racist asshole” and stormed out. (FYI i am not a racist or an asshole. i just believed that all black people are the opposite of caring, nice, funny and handsome.). a few days later, my mom called me and yelled at me for punching my sister. she made me move out, and now I have nowhere to live. AITA?