The Republican Party's economic/tax policies have reached a point where the number of people who actually benefit from them is incredibly small.
Unless you are in the top 1% of incomes (greater than $434,000 in 2018) and you make most of that income from dividends and capital gains as a business owner, you don't benefit from GOP economic policies.
Johnson County's median household income is $73,733. Such a household would indisputably be better off under Democratic policies.
But either way, nobody votes purely out of economic interests.
This is just objectively false. 88% of Americans got a tax cut per the WSJ.
Having my federal income taxes reduced by a small amount is outweighed by the other things the GOP does/wants to do that either don't help me or actively harm me as a consumer and an employee.