The real issue with trump isn't that all his followers are nazis, because they obviously aren't. It's that he has a direct dialogue with people that think like that. It's that he retweets white supremacists unapologetically, and has skin heads at his rallies without muttering a word of disapproval. He incites this division, which empowers racist groups.
It also empowers the insensitive. People tired of hearing about minorities and finally able to say what they always wanted: fuck them, what about me? These are the same people that are oddly vocal when given the chance to proclaim that they don't find black women attractive, or that all lives matter, or that transwomen are men and they have a right to opinion, etc etc. We don't have a president that is pushing forward unity but instead embellishing division. And racist groups love division
It's not about labeling specific voters, but instead labeling the conversation that is bubbling now right out in the open. And of course liberals wish everyone was against it enough to never vote trump. If you vote trump anyway, then they feel ya just don't care about the division he is creating, which I feel is probably true. You may not actually believe in keeping minorities down, or actually hate anyone....but you are also not exactly fighting against people that do this either