Capital gains being taxed at a lower rate sets up a regressive tax structure. It's not even a flat structure. It's actually punitive to the poor and working class. This isn't even mentioning all the other tax loopholes and shelters that are only available to the wealthy (example: Trump carrying a $1b loss forward for 20 years).
I see the mis-education is going well. This is why capitalists love low information voters (aka "useful idiots").