Progressive here. I vote in every primary and try to rally support for the most progressive in my coalition. Come November, I vote against fascists which means voting for Democrats because they're obviously better in every way.
If you don't vote or vote third party, congratulations, it means you were duped by right-wing propaganda or don't understand how our election system works and the inevitable binary outcome that comes with FPTP and whole you didn't give fascists +2, you gave them +1.