I really don’t think any posts here will affect you or help you in any way–since you clearly have a superiority complex.
If she had an attitude problem, if she was rude to your parents, didn’t respect you etc–i could understand your reservations. but to call her irritating for wanting to be your friend, to point out her ethnicity, and criticize her for the way she interacts with her own family, those don’t seem valid reason sto not like someone.
There’s nothing wrong in being interested in your brothers life–after all you are a sister, and siblings should be involved in each others’ lives. but if you are really so indifferent then this thread wouldn’t even exist now would it?