On The Origin Of The Species Known As Political Correctness.
Political Correctness is a force - unfortunately. Its repeaters and amplifiers are motivated by man's most primal fear: exclusion and mockery. Without bears and mountain lions as predators, man's greatest opponent is man. As thinking beings (usually), disagreements are conducted with words not fists. In a hyperconcentrated hive of human activity like a large city, the pressure the author refers to is unrelenting - literally 24/7. Most are not up to the task. And if the energy born of social anxiety is not used to resist, it is almost always used to engage in enforcement of perceived social norms. That rush they feel at being 'on the right side of history' is merely the relief of fitting in.
In keeping with the hunter-gatherer analogy, women are even less apt to violate group boundaries i.e. take risks. They would prefer the boundaries be eliminated or at least unenforced. Those insipid 'Coexist' bumper stickers are merely a testament to cowardice and an unwillingness to admit that right and wrong exist - and wrong couldn't be happier about it.
Political Correctness is a an obvious latticework of lies (it has been accurately called a War On Noticing). We despair as it creeps into every corner of our lives but it could not do so without a critical mass of the weak-minded. The Times has been doing its bit for decades and now the schools and the pop culture (via unfunny doctrinaire comedy, boring autotuned 'music') have adopted their tactics to produce legions of the intellectually naked.