One of the most useful things I ever learned was that siblings act out how they feel, and can project any resentment and feelings of inadequacy onto a (usually) younger sibling. So all those things he called you were probably how he felt at the time. Does it make it any better? Not really: you still had to endure it.
Many parents don't see the abuse between siblings that is happening right under their eyes, either because they think it's normal or they don't recognize it. Yet sibling bullying, as you have seen, not only happens but has profound effects.
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