The middle class and upper middle class are highly attached to the institution of school explicitly as a sorting mechanism, as a way of justifying privileges of which middle-class members are already central beneficiaries. These critics suggest that the entire notion of schools as meritocracies actually reifies and reinforces class privilege--making those whom school rewards (those who already have a lot of benefits) feel they deserve the privileges they have.
Kirsten Olson Wounded by School: Recapturing the Joy in Learning and Standing Up to Old School Culture