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Even that Foucault bit is only very uneasily postmodern. There's too much "power over", the Marxist references (neo-liberal capitalism) are too much to the fore, the capitalitzed "Other" - okay, so there's Levinas and Lacan, but also Hegel, Sartre, etc. Foucault's an odd fish.
I don't think it is a distraction - even from your point. There's a danger in lumping all ideas that are expressed using ridiculous language into the dustbin labelled "postmodernism". There's a guilt by association issue.
The point he seemed to be making in that tweet - that capitalism sells us this idea that our bodies are objects that can be moulded to express our essential self, and that an emphasis on body beautiful results in a commodification of bodies etc., isn't stupid.
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