So they believe that Democrats automatically means higher taxes for them, regardless of income level.

Should you manage to get them to consider the taxation would only target the wealthy, they are afraid the wealthy class will fire them due to the loss of money. Similarly afraid that stronger worker protections would just lead to the jobs going away. They think the benefits achieved by Democrats favor cities and rural areas don’t see their moneys worth. Now they didn’t spend that much money on taxes and they do get great benefit, but they see the cities get bigger stuff and that leaves an impression.

Speaking of jobs going away, they fear immigrants. Both on racist grounds and the general perceived increase in labor competition.

Fewer arms to Ukraine because they see it as wasting money on a cause that has nothing to do with them. More arms to Israel because they are afraid of Muslims.

Particularly dangerous as key people recognize this is a lot of people, but not the majority. So there’s a great fear that democratic voting means they would ultimately be marginalized. So they also are the party most inclined to game the vote however they can, mapping districts, limiting voting access, stalling absentee ballots.