I am coming from a left-wing perspective: always voted left and very supportive of fights for social justice, which is also why it makes me angry when the language police comes to shut me up and call me names that I am definitely not.
I think PG is right in many aspects: it's a sort of empty moralism, a way to signal virtue based on an arbitrary, ever-changing set of rules. The intention is to be inclusive but it ends being snobbish and exclusive. I hope that PG is also right about this attitude -or fashion- to be on the retreat, especially if we want to get serious about social justice again.