I dont care what school you are in, if I had been in the same situation, I would have been incensed and made a damn big scene!
Right then and there!!!!!!!!!!!!!
It is then the decision of your Organization if they want to Associate with them further. You as a group then let it be known on campus via the word of mouth about the treatment and let it takes its course.
Knowing only of the situation of what you told us, we do not know exactlly what was going on, what school, what demographic area, ETC! Yes, I think it still goes on but you are there along with a lot of other people who may be able to change it!