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You make an excellent point.
The fact is that most women, no matter what they do, aren't going to end up with a butt like Buffie. In addition to big butts, we'll get big guts, big thighs, big arms, and big faces. Then we'll be consigned to the legions of "fatties". (Think Venus of Willendorf.)
Sorry guys, when you fetishize big butts, you're not doing women any favors. You're just telling those of us who can't attain those proportions that we're not hot enough for you.
Most of these things are fads anyway, and there will always be only a very small percentage of women who can measure up at any given time.