Mom sympathetic towards older brother?

my older brother is socially awkward and doesn't spend his time with other people his age. he's never had a girlfriend and spends most of his nights either playing online games or doing homework. he gets extremely annoying and demanding whenever he gets stressed (tests, exams, and such). he thinks his time is more valuable than anyone else's. it makes me SO angry. my mom gives him more sympathy than anyone else. i think it's because he really doesn't have a social life outside the family and she tries to make up for it. me and my other brother have perfectly normal social lives. whenever i retaliate against my brother my mom defends him. how can i get my mom to treat him like she treats us? or how can i deal with her sympathies for my brother?