Brian Luke said this quote

From a nonpatriarchal metaethical standpoint, however, Singer's and Regan's theoretical similarities are as significant as their differences. In particular, both Singer's utilitarian theory and Regan's rights approach are developed within a framework of patriarchal norms, which includes the subordinatin of emotion to reason, the privileging of abstract principles of conduct, the perception of ethical discussion as a battle between adversaries, and the presumption that ethics shoudl function as a means of social control.

~ Brian Luke