Maybe they just don't want to pay ever higher taxes for out of control spending on ineffective and substandard government services from which they don't benefit, and maybe they don't like Democratic sympathies on issues like crime, etc.
The current Republican administration/congress is the most out of control spending in the last 40 years, so your accusation holds no water (but I'm sure you'll still try to get people to fall for it).
And maybe they don't understand that Democratic economic policies help everybody and only hear the tired, worn-out lines about evil "government programs" and "higher taxes". And the meme about Democratics being sympathetic to criminals is another largely false one that Republicans love to spew.
I'm sure that living in New Hampshire, you develop an in-depth understanding on the fear of minorities. Why don't you wait until you've lived in a racially mixed urban area before passing judgment.
I lived in Denver for a year (three blocks from E. Colfax, possibly the worst neighborhood in the city) and also lived just outside Boston for over a year. So I have lived in racially mixed areas before.