I get the impression it was very different in the early 20th century, but I honestly think that fascists in the early 21st century on the whole probably don't even realize they're fascists and will reject being called one purely on reflex. You see this particularly well in a lot of terminally online nerd spaces where people will state and argue for cis white male patriarchal supremacist positions without a moments hesitation but will react with complete incredulity if you call them on it. Some of them are being self aware crypto-fasch sure...but a lot of them just deny it because they have just enough awareness and self preservation that they recognize that makes them a bad person and doing any work to be better is much harder than just pretending.

All this is to say: the people who voted in favor of fascism are the ones already excited to slap a swastika on. A huge number of the people who voted "Don't Know" are probably down to fuck with fascism...they would just rather call it liberalism.