Help my best friend's brother hates me for no reason

(14F) have known my best friend (12F) for four years. I’m on good terms with her whole family except for her brother (14M), who seems to hate me for no reason. For example, I was on FaceTime with my best friend while her brother was gaming and on the phone with his friends. As soon as I joined the call, he and his friends immediately started talking about me; I knew because I kept hearing my name. He called me ugly, and he and his friends also used to ding-dong-ditch my house a year or two ago.

It’s getting really annoying.

at school, he and his friends were across the room from me, and I kept seeing him look over. He never does that when he’s alone during the class we have together (though I’m not 100% sure, since I sit somewhere where he could be looking without me seeing). At one point, they all turned and looked at me at once. For as long as I’ve known my best friend, he has never talked to me or done anything nice. He sits near my friend at school, and when I go to talk to her, he shifts his whole body so he isn’t even facing me.

He stopped looking at me as much which is kind of annoying because it felt nice to have some type of connection to him. Speaking of feeling a connection I feel like we have one even though we don't talk I think about him a lot and I always wonder if he does too

I talked to him saying, " Can we just talk because I don't understand why you don't like me but he looked at me confused ignored me and walked away. People usually say he either secretly loves me or he really does just hate me for no reason.