Hummus does not equal bean dip. Hummus is made of garbanzo beans and tahini. If you leave out the tahini, it isn't hummus (or hummus bi tahini, which is the full name). Also, hummus means chickpeas. Hummus does not mean bean dip! If you make a dip with black beans, don't call it hummus. Thank you.
(And a Facebook friend of mine doesn't even know she was just spared a hummus rant on her wall.)