Nope... you don’t have to stay. You could feel the bern... or you could become a libertarian.... or you could just skip the primary process all around and vote in the general each election for whomever you want to be king....
Good advice, similar to let them eat cake! We know what happened to the person who uttered that famous line.
When the primary comes around in my state, I will vote. If my vote ends up not counting because it was ignored, I will not vote in the general election.
This election has been a real eye opener. There is no way for voters to win.