This passage was written in 1958. Today, King's biased choice of pronouns seems very dated to our ears. He was in fact unaware that his choice of words were reflective of a massive system of oppression which pushed women to the margins. A modern day King, writing this paragraph in 2017, would not have made the same mistake. Even so, King's words are timeless in their underlying meaning. Often systems of oppression are so pervasive that oppressors are not even aware of the harm they do. Often victims of opression are complicit with their own oppression. We are all called to "massive non-cooperation" with evil systems.
Photo credit: Dick DeMarsico, World Telegram staff photographer [Public domain], via Wikimedia Commons