The left is engaging in identity politics, divide everyone into "tribes" based on demographics, then make them fear each other and/or society at large. Then they will obediently do whatever their saviors, the Democrats, say.
You also get the immoral combination of tribe with faith, identity group with politics. This is how conservative women can be called whores, not really women, for being conservative, just as conservative blacks are savaged by other blacks for "betraying the tribe" or called "not really black" by whites. The identity politics creates social pressure to stay loyal to the ideology, and those who betray it are rejected by the group as traitors.
You can't have unity when a political party is using identity politics to keep everyone divided but reliant on them.