Not every Trump voter is a bigot, I’m certain of that. People have different problems in their life and have to be pragmatic in how they use their voting power. Some have different priorities, some have been misled. What you’re doing is only polarising society and because nobody wants to be wrong it only leads to entrenching in positions which those people might not have held before.
Yeah, tell me how well applying this to anyone voting for Trump goes in a couple of years. If you have a moral high ground but didn’t achieve anything then is it something you’re interested in?
For starters, by not assuming every single one of them blames all their problems on people purely based on their birth characteristics. Treat them with no prejudice. You’re likely prejudiced against lower class people and not even realise it. Listen to what they have to say and see what led them to distrust public institutions, what are their troubles and priorities.