That's an absurd argument, but if we accept it, does the fact that 57% of college students are female (citation below) prove that the educational system is biased against men? Is it biased in favor of Asians, who make up less than 5% of the population but are "over-represented" at elite colleges?
No. It shows that biases exist, but it doesn't show that the educational system is necessarily at fault.
For instance, we know that Asians are "over-represented" because they place a premium on advanced education that other cultural groups do not, so they are self-selecting for college. Also, US colleges are taking on a large number of non-resident Asian students, so those numbers need to be considered apart from those drawn from the resident population.
Boys have attractive options for advancement outside of college, most significantly in the armed forces, where strong biases exist to attract boys and repel girls.
Both of these examples of bias influence college numbers without implicating colleges in any way.
