Do black women tear each other down more than other races?

In lieu of it being Black History Month, we are going to face the elephant in the room!  Do black women tear each other down?  It amazes me as to when I hear of someone's success, there are others who find the slightest crevice to tear it down with little words like, "she ain't all that!"  "Honey I remember when!".  Are we bitter towards one another and if so, why?  Is it because we are not happy where we are or simply don't respect one another? 

We are some of the most intelligent people I know, are creative and can take the impossible and make it possible with the help of God!  Somebody tell me what's really going on!  I can't wait to hear from my sistas!!