Because our concepts of gender and sexuality are massive oversimplifications of complex systems which people have long since forgotten the historical reasons for. To engage with them as an adult really does leave you staring into the void, especially if you’re doing so ahistorically and with the goal of upholding some aspect of this childish patriarchal construct.

I think transvestigation is strange in that its not transphobic in its core but its outward manifestation is completely transphobic. The core of transvestigation seems to come from insecure women who know they could never look like celebrities and dont consider the wealth that buys the surgeries, chefs and personal trainers that are needed to look like that and instead conclude that it must be because celebrities are trans. After that they have to create an entire mythology to make 'every famous person is trans' make sense as a political project. The racism against black women that had chuds convinced Michelle Obama was probably very influential in their worldbuilding.

A bit how certain strains of 19th century anti-semitism were described as 'socialism of fools.'

I’m convinced they likely have bodily or facial features that are, on the surface level, common to the opposite gender. Because they hate trans people and have internalized the strict gender binary, they cope by becoming delusional and thinking everyone is secretly trans. If everyone is secretly trans, then they won’t feel bad because they’re a biological woman with an Adam’s apple or some shit.