Many years ago, I left the Democrat party primarily because of their platform promotion of abortion and joined the Republican party. But I later left the Republican party when I realized they largely gave twisted logic concerning socio-economic equity. So I vote and otherwise operate independent of either party.
It seems there are at least two named groups actively promoting exit from the Democratic party: BLEXIT for Blacks Exit and JEXIT for Jewish Exit. I suppose the names are chosen based on the British exit from the European Union which was called Brexit. These of course have perhaps somewhat overlapping but yet different emphasis as to the reason(s) for their promoted exit.