1.) None of the women are really fat. Thick maybe, but they all have feminine figures and are nice looking
2.) The only really fat person in the video is a man. So it is okay for men to be very large, but not women
3.) "all the right junk in all the right places" acknowledges that some women carry their fat better than others
4.) "every inch of you is perfect from the bottom to the top" so disregard #3
5.) "bringing booty back" So #3 still applies after all
I don't really care one way or the other, it's a catchy song, but I can see why some people don't know how to interpret it.