Feel free to ask Michael in the comments of his blog, he frequently replies, helpfully, with references. I mean all science is tentative, so skepticism is healthy.

Also seems relevant

Like in the deer, the large-scale target morphology can be revised – the pattern memory re-written – by transient physiological experience. The genetics sets the hardware with a default pattern outcome, but like any good cognitive system, it has a re-writable memory that learns from experience.

I think there is a nugget of truth here in so far as that you can't live life trying to make everyone happy, but also, you get what you shop for so, have fun with the shit heads.

Paradoxically, I think they literally are swimming in self shame. A lack of processing that shame is why dumping five more pounds of it into their psyche doesn't effectively alter any part of their behavior.