Why is my bfs older brother so rude and constantly putting down my boyfriend in front of me all the time?

My bfs older brother shouts in front of everyone and says negative things about his younger brother in front of me - that he’s an idiot and has a bad disability and what do I see in him and that he useless, etc…. why does he do this?

does he hate his brother or is he jealous?

Jealously towards me and his brother
Doesn’t get along with his brither
Other - pls explain
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Why is my bfs older brother so rude and constantly putting down my boyfriend in front of me all the time?
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