Is it weird my brother is still mean

I don’t know why he is. He’s almost never nice to me. He’s 23 I’m 20. He lives down in college at his apartment. He would only ever get lunch or dinner if it was a bday, or if he owed me cuz I always do favors for him. Whether it’s being designated driver, dropping off something to him, etc. and his college is not close by at all

I’m always nice. I try not to annoy him. I get him gifts sometimes for no reason. It’s just so bumming.

Only thing I’ve been able to think of is he doesn’t like me or he resents me for being babied by my parents growing up. But get tf over it. Now he has been prioritized the last like decade. It’s even. Plus that’s how it fucking goes when ur the youngest. It wasn’t even that bad growing up.

He’s like this with both my parents. He did nothing for Mother’s Day cuz he was planning a friends bday party for the following week. My mom is so depressed cuz she thinks he hates her .... I don’t think hate is the word but he’s so so so distant from the family. And with his friends parents it’s the opposite. We do so much for him idk wtf his deal is! Been like this since high school