I knew A LOT of white women in top sororities in back in college.
This was the south but I think a lot of it has to do with class and status that fuels the racism.
They associate black with lower class and they have to maintain an image of privilege and success or else top tier white people won't join the organization. A lot of them didn't mind hanging with black people and non sorority cats as long as they maintained their status. I hate to sound like a c00n but it's not that dislike black people but they love portraying their image of success more than they do treating black people as socially equal in their organization if that makes sense. It's fukked up but it is what it is. They are like old money republicans more than anything.
I had a lot of those lily white sorority chicks flirting hard with me with bedroom eyes when there were no white guys around. Often they had to go back to that "exclusive" mindset when it came time to be out in public. A few of them were throwing that pink p*ssy towards me on the DL so they could maintain their reputation. The exclusive white thing is only an image. Quite a few of them come from old money and they are smart but they can be a bit air headed at times. Some of them are just skanky in general. One sorority chick I knew fukked a cop to get out of a drinking ticket and others were practically frat mattresses. They drink, smoke weed, curse, party, sleep around, they LOVE Drake/2 Chainz/hip hop and do everything everyone else does but it's just that they have money to floss and maintain a privileged life.
Sororities are there to help network and get exclusive connections but I strongly suggest black women form their own sororities and get their own organizations started. These white chicks in upper tier sororities come from families who own horses, take lavish vacations every year, and have a lot of old money connections. They sure are hell aren't going to share that with a black girl unless she comes from that background as well. Often times the only black girls with that background are super white washed biracial chicks with white daddies or upper class jack and jill type black kids. Real nikkas know what I am talking about.