True, there is a lot of racism in Saudi Arabia, even among their own people.
It's like "our tribe is better than yours, i will not allow a girl from our tribe to marry a man from your tribe" etc
Many problems comes from those people and sometimes when man and woman get married from different tribes, one of the tribe will gather 200-300 from them and their elders to revoke the marriage, it's disgusting.
There is a way to get citizenship, but you have be be very famous and have a lot of money and make big business، those people are also get a lot of hate of being "not pure blood"
30 years resident and still don't have "green card'