Its not the definition of fascist that is so much the problem (perhaps a bit)... at least not for me. I'd tend to agree if you support Trump you support fascism.. the bigger issue was the comment about "white people" and how to even define who is white or not.
I dont think people who support trump support him **because** he is fascist. But I do think that if you voted for trump you voted for a person who clearly has fascist tendencies...
Now that said I would say the same about voting democrat, equally so if you vote democrat you are voting for fascism, just of a different flavor.
Supporting either party right now is a support for fascism in my eyes.