Boyfriends brother

My boyfriends brother hates me! I was on the phone to my boyfriend today and his brother walked in and he started saying I was fake and stuff. I don’t want him to hate me. He is an older brother and my boyfriend keeps telling me his brother has never liked any of his girlfriends but that makes it even worse because I am different to them. I don’t know what to do to get him to like me. Any ideas?