> This essay was somewhat high on opinion, somewhat low on evidence
That's putting it mildly. It's littered with straw men and other logical fallacies.
He asserts, without any proof (because it's a faulty generalization that can't be proven), 'when someone calls a statement "x-ist," they're also implicitly saying that this is the end of the discussion'. He then wastes a bunch of time explaining the implications of his straw man.