Both sides hate moderates. Moderates are the ones who say “yeah but here’s what’s wrong with your candidate...” and make valid points. True believers from the other side don’t bother them, they’re just the other side. But people who can criticize their candidates in a way they listen to, that bugs em.
That might be true if what we call moderates today were anything but yesterday’s progressives who didn’t move farther Left with the rest.