Not sure what part you're referring to but it's more or less overt that many of them think trans men are basically women. This combined with what they say about trans women is most of where the accusations of essentialism come from.
> TERFs primarily don't focus on trans men because they see them as misguided women.
Not well versed in feminist theory, but I’m curious whether anyone has formally documented in the scientific literature these sorts of psychological attitudes.
Probably a cross-disciplinary masters thesis worthy topic if no one has done that research yet.