I read or watched something recently about the way fascists think/argue that finally made a few things click for me.
They start from what they insist is Truth, statements like "there are only two genders." Other people might respond with information about intersex people & the complications of defining something like "biological sex". These are facts, related to observation of reality, but to a fascist, anything that doesn't align with the Truth in their heads can be rejected outright.