Honestly, I think it's hilarious. Obviously it's supposed to be a joke. You can tell by the staged photographs (they are all wearing the same clothes in the pictures) and the pictionary photos.
I truly believe the site was created by some intelligent black person somewhere who was just trying to get a laugh. It's just a parody how of a lot of white people think that having a few black associates and using black slang makes them "down"
I am not at all offended...if anything, I would think white people who view this would be offended because the joke is at their expense.