By far and away the best critique of social constructionism I’ve read is psychologist David Kidner’s brilliant book Nature & Psyche: Radical Environmentalism and the Politics of Subjectivity. It’s a wonderful example of deep and careful academic thinking which never loses itself to showy jargon. His basic thesis is that modern psychology and the type of constructionism rife in the humanities constitute a betrayal of our true place in the natural world, and both are in an important sense allied with the project of modern industrialism. Postmodernism’s problematisation of ‘the natural’ out of existence is of a piece with the ongoing ecological havoc we’re wreaking. Importantly, Kidner doesn’t regress into a traditionalist simplification and glorification of ‘natural order’ (which Peterson seems a little prone to). His point is that order does exist in the natural world, but in such a diverse proliferation that there are roots there for a great variety of cultural fruits. In this light, the more extreme postmodern flights into texts decoupled from ‘nature’ seem to be a mistake: they’re flights from the traditionalist simplifications of nature, forgetting our grounding in the complexity of nature itself in the process. (Though again, I suspect there probably is good work within these leftist currents, ignored by Peterson, that recognises this and grapples intelligently with it.)