SHE’S DONE HER RESEARCH The Earth is not flat (45 seconds) — it’s concave. She may be wrong about Trump and the planet’s shape, but she seems harmless and friendly enough. Not so . . . “CHUD THE BUILDER” The Right’s Worst New Star Just Shot Someone [His} gimmick is that he films himself  walking around calling black people the n-word or accusing them of “chimping out”—a racial slur comparing black people to monkeys. When the people he’s accosting get understandably mad, he encourages them to attack him so he’ll have an excuse to defend himself with mace or a gun. Whatever shape he thinks the Earth is, he’s clearly awful and dangerous. But he’s just one guy. Not so . . . A WIDE AND ENDURING CONSTELLATION OF WHITE SUPREMACIST GROUPS As described by Steven J. Ross in this important interview with Rachel Maddow.…