My mother goes to the YMCA, even though she is not young, a man, nor a Christian.Okay, continue onward with your denial of word definitions.
Black sororities are targeted towards Black women, but do not exclude anyone. There are almost always a few of whites, Hispanics, and East Asians in Black greek system. They often grew up in Black neighborhoods, and have friends and a greater cultural affinity with a Black sorority or fraternity.
It is easier for a white to get into a Black house than for a Black to get into a white house... Which is part of the reason I did not join the greek system. It felt racist to me.
So I guess the question here is: GFM, did you not go to college, did you go to college more than 40 years ago, or did you just not pay attention to what was happening?