And that person that at the moment now has the bad luck not to be able to pay income taxes has every right to vote as you have. He may or might have contributed way more than you have to society or he maybe in the future he will do. And even if he doesn't, in a democracy everyone has the right to vote, even people with elitist arrogant opinions.
Also, as I said before, most people in the US pay taxes if not all people in the US. There are payroll taxes, capital gains taxes, state taxes, fuel taxes, sales taxes, etc. etc. etc. and most pay 1 or more of these taxes. Personally I think virtually everyone pays 1 or more of these taxes.