Alt-Left must be the opposite of Alt-Right. So... opposite of racists, white supremacists, misogynists, and bigots.

Whaddya know, I'm Alt-Left!

Good vs. evil. You can be a Nazi, a Nazi sympathizer, or anti-Nazi. Only 1 of those is good, 2 are evil. We now know that the President and his supporters are Nazi sympathizers, at best.