Very much for the same reason that only guys like Bill Cosby can critize fellow blacks. Because men will get creamed, called chauvinist pigs, female-phobic and all kinds of ugly things when they dare to publicly critize womanly failings. Oddly, women don't receive the same condemnation when they criticize and belittle men.
Couldn't you figure that out for yourself, or do you just like catfights?