I assume when you say South Asian - you mean Chinese, Japanese, Korean etc.?
I'm Chinese and my parents don't think highly of Black people, which perhaps could be that blacks were known to be slaves in the past (meaning no offence), and asian culture is quite mostly around money and success. My sister has a best friend who is black and my parents get annoyed when she brings her over.
I wouldn't know why they they are like this, but maybe its down to culture. For me, I don't really care about someone's race.