My boyfriend's brother is being rude to me for no reason?

Anonymous
I was with my boyfriend in his room and his brother (20 yo) came knocked on the door and kicked it until the door fell off and screamed "Get that bitch out of here right now". My boyfriend is 18. I met his brother a few times and he didn't talk to me at all. I feel like he hates me for no reason and he was super rude to me. What do I do about this? I don't wanna be rude to him because I know he's very close to my boyfriend but I feel like what he did was so wrong and immature. How should I approach this situation?
My boyfriend's brother is being rude to me for no reason?
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