I don’t support any Democrats even the ones with an R next to their names. If you fail to understand what that means, that is your problem.
If a contest is between a Republican and a Democrat and there are 10 voters, 5 Republicans and 5 Democrats, what are the possible outcomes? If all the Republicans vote Republican and all the Democrats vote Democrat, the race is a tie and it’s decided on a coin flip.
If one of the Republicans votes for the Democrat, or if that Republican stays home and doesn’t vote, the Democrat wins. The same scenario applies in reverse if a Democrat voter does the same.
Your behavior helps Democrats, that’s the part that I understand.